Issue: 19400401

Monday, April 1, 1940
April 1940
4
True
136
Saturday, January 3, 2015

Articles
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POPULAR SCIENCE
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PopularScience_19400401_0136_004_0001.xml
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NATIONAL CARBON COMPANY, INC.: "Eveready”
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NATIONAL CARBON COMPANY, INC.
"Eveready”
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PopularScience_19400401_0136_004_0002.xml
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1
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Chrysler Corporation
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Chrysler Corporation
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PopularScience_19400401_0136_004_0003.xml
masthead
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POPULAR SCIENCE
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PopularScience_19400401_0136_004_0004.xml
tableOfContents
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2,4,6,8
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CONTENTS FOR APRIL 1940
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PopularScience_19400401_0136_004_0005.xml
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3
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Advertisement
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PopularScience_19400401_0136_004_0006.xml
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INTERNATIONAL CORRESPONDENCE SCHOOLS
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INTERNATIONAL CORRESPONDENCE SCHOOLS
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PopularScience_19400401_0136_004_0007.xml
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Advertisement
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PopularScience_19400401_0136_004_0008.xml
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CHAMPION SPARK PLUG CO.: CHAMPION SPARK PLUGS
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CHAMPION SPARK PLUG CO.
CHAMPION SPARK PLUGS
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PopularScience_19400401_0136_004_0009.xml
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8
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Lambert Pharmacal Co.
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Lambert Pharmacal Co.
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PopularScience_19400401_0136_004_0010.xml
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LASALLE EXTENSION UNIVERSITY
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LASALLE EXTENSION UNIVERSITY
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PopularScience_19400401_0136_004_0011.xml
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10
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Advertisements
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PopularScience_19400401_0136_004_0012.xml
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National Radio Institute
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National Radio Institute
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PopularScience_19400401_0136_004_0013.xml
article
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12,14,16
Our Readers Say
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Our Readers Say
The Home Workshop Department Got Him Off to a New Start
She Could Probably Tell HIM a Few Things About Styles
He Favors New-Car Gimcracks That Really Are Useful
Take It from One Who Knows: The Thermostat Is Hot Stuff!
Proposes That Scientists Strike Against War
Pall of Ship's Smoke Appalls This Reader
Try This One On Your Phonograph
Well, Why Doesn't He Try a Secondhand Store?
If He's Already Gone That Far the Rest Ought To Be Easy
A Shock Absorber for the Nerves Is What Parachute Jumpers Need
A Play in Five Acts with Plenty of Mystery
Thanks, We'll Take Ours With a Grain of Salt
If She Reads This He'll Get a Darn Good Sock!
A Simple Way To Test Thermometer Accuracy
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YOUR Home Workshop Department has been a course of instruction to me that means as much as my schooling. Thirteen years ago I was taken ill with arthritis that left me handicapped with a crutch under each arm. I was a machinist and draftsman, but when I got well enough to work again I found there just wasn’t any to be had.
PopularScience_19400401_0136_004_0014.xml
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American School
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American School
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PopularScience_19400401_0136_004_0015.xml
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15
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CLARENCE A. O'BRIEN
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CLARENCE A. O'BRIEN
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PopularScience_19400401_0136_004_0016.xml
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16
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Advertisement
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PopularScience_19400401_0136_004_0017.xml
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17
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LIGGETT & MYERS TOBACCO CO.: Velevet
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LIGGETT & MYERS TOBACCO CO.
Velevet
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PopularScience_19400401_0136_004_0018.xml
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18
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Advertisements
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PopularScience_19400401_0136_004_0019.xml
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Advertisements
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PopularScience_19400401_0136_004_0020.xml
article
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With the Inventors
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CHANGE is automatically made when a dime or quarter is inserted in a robot cashier worked out jointly by William B. Evans and Duward A. Lawson, of Nashville, Tenn. Designed for installation in or near telephone booths, subway stations, amusement galleries, automatic cafeterias, and other places of business, the machine enables customers to secure small change without waiting for or disturbing a human cashier.
PopularScience_19400401_0136_004_0021.xml
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VICTOR J. EVANS & CO.
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VICTOR J. EVANS & CO.
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PopularScience_19400401_0136_004_0022.xml
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Aero Industries Technical Institute
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Aero Industries Technical Institute
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PopularScience_19400401_0136_004_0023.xml
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23
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INTERNATIONAL TYPEWRITER EXCH.
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INTERNATIONAL TYPEWRITER EXCH.
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PopularScience_19400401_0136_004_0024.xml
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23
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THE FATE-ROOT-HEATH CO.
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THE FATE-ROOT-HEATH CO.
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PopularScience_19400401_0136_004_0025.xml
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24
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INTERNATIONAL CORRESPONDENCE SCHOOLS
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INTERNATIONAL CORRESPONDENCE SCHOOLS
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PopularScience_19400401_0136_004_0026.xml
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Advertisements
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PopularScience_19400401_0136_004_0027.xml
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Advertisements
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PopularScience_19400401_0136_004_0028.xml
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Advertisements
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PopularScience_19400401_0136_004_0029.xml
article
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NEW IDEAS FOR Home Mechanics
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Electric Sander and Polisher Equals Finish of Hand Work
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WEIGHING only four pounds, and easy to operate with one hand, an electric sanding machine now available to home owners is designed to perform hand sanding work mechanically. Employing a quarter sheet of eight-by-eleven-inch sandpaper, the machine quickly smooths any surface in a manner that is said to equal the best hand work of a master craftsman.
PopularScience_19400401_0136_004_0030.xml
article
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NEW IDEAS FOR Home Mechanics
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New Cleaning Compound Removes Rust, Stains
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HOME OWNERS should find many uses for a new cleaning compound that is said to remove rust and heavy stains from all enamel, porcelain, tile, or metal surfaces. Specially designed for cleaning use in the bathroom, laundry, and kitchen, the compound may also be employed in restoring the original natural luster of surfaces made of such stone as marble and granite, and of chromium, steel, copper, German silver, and other metals frequently used in the home.
PopularScience_19400401_0136_004_0031.xml
article
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NEW IDEAS FOR Home Mechanics
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Polishing Block Erases Furniture Scratches
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MINOR scratches, marred spots, and scuffed places on furniture are removed quickly merely by rubbing them with a special block, according to the manufacturers who have just placed it on sale. The block is made of felt impregnated with a chemical solution and fitted with a wooden top which makes it easy to grasp in the hand.
PopularScience_19400401_0136_004_0032.xml
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Advertisement
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PopularScience_19400401_0136_004_0033.xml
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WARNER ELECTRIC COMPANY
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WARNER ELECTRIC COMPANY
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PopularScience_19400401_0136_004_0034.xml
article
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HELPS FOR HOME OWNERS
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New Paint Covers Stains
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To PREVENT oil and pitch stains, sap streaks, and other blemishes on wood from “bleeding” through a finish coat of paint, a new type of paint is now available for use as a priming coat. Applied either with a brush or a spray gun, the protective paint dries in about half an hour.
PopularScience_19400401_0136_004_0035.xml
article
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HELPS FOR HOME OWNERS
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Clear Shield of Plastic Protects Switch Plate
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SWITCH-PLATE shields made of non-inflammable plastic material are now available to home owners. The plates are made in white, ivory, or clear—the first two styles being designed to fit over regular switch plates that have become worn, soiled, or cracked, while the transparent style is used to protect any existing ornamental shield, preventing it from becoming soiled.
PopularScience_19400401_0136_004_0036.xml
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SMOOTH-ON MFG. CO.
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SMOOTH-ON MFG. CO.
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PopularScience_19400401_0136_004_0037.xml
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The FRED. GRETSCH MFG. Co.
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The FRED. GRETSCH MFG. Co.
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PopularScience_19400401_0136_004_0038.xml
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McKinley-Roosevelt Graduate Colleges
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McKinley-Roosevelt Graduate Colleges
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PopularScience_19400401_0136_004_0039.xml
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31
31
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MILWAUKEE SCHOOL OF ENGINEERING
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MILWAUKEE SCHOOL OF ENGINEERING
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PopularScience_19400401_0136_004_0040.xml
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NATIONAL SCHOOLS
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NATIONAL SCHOOLS
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PopularScience_19400401_0136_004_0041.xml
article
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Questions FROM HOME OWNERS
Floor for Sleeping Porch
Whitewash for Stone Walls
Raw and Boiled Linseed Oil
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Q.—WILL you please tell me what I can put in a corner by a chimney to keep the plaster from cracking ? I have tried several kinds of patching plaster, but as soon as there is a fire in the furnace the plaster cracks again.—O.K., Davenport, Iowa. A.
PopularScience_19400401_0136_004_0042.xml
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LAFAYETTE RADIO
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LAFAYETTE RADIO
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PopularScience_19400401_0136_004_0043.xml
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THEO. AUDEL & CO.
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THEO. AUDEL & CO.
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PopularScience_19400401_0136_004_0044.xml
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Advertisements
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PopularScience_19400401_0136_004_0045.xml
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PopularScience_19400401_0136_004_0046.xml
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PopularScience_19400401_0136_004_0047.xml
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PopularScience_19400401_0136_004_0048.xml
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PopularScience_19400401_0136_004_0049.xml
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PopularScience_19400401_0136_004_0050.xml
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PopularScience_19400401_0136_004_0051.xml
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PopularScience_19400401_0136_004_0052.xml
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PopularScience_19400401_0136_004_0053.xml
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42
42,43,44,45,46,47,48,49
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POPULAR SCIENCE Classified OPPORTUNITIES
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PopularScience_19400401_0136_004_0054.xml
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R. J. Reynolds Tobacco Co.: PRINCE ALBERT
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R. J. Reynolds Tobacco Co.
PRINCE ALBERT
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PopularScience_19400401_0136_004_0055.xml
article
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51,52,53,54,228
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Super-Gasoline for Your Car
480 MILES ON A GALLON OF GAS?
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JOHN E. LODGE
LIFT the hood of one of tomorrow’s motor cars and you will have to look twice to find the engine. It will seem like a midget beside the motor of a 1940 model. Yet, such mechanical pygmies will give you greater power and more mileage than the most efficient engines of today.
PopularScience_19400401_0136_004_0056.xml
article
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NEW INVENTIONS
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Cheap Rubber Molds Cut Casting Costs
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TREMENDOUS savings in the cost of making cast novelty jewelry and small metal parts are said to be made possible by molds made of rubber instead of solid bronze, the usual material. A mold is made simply by sandwiching samples or models of the articles to be cast between two soft rubber blanks which are then forced together and vulcanized.
PopularScience_19400401_0136_004_0057.xml
article
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UNUSUAL FACTS AND IDEAS
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Unit Tests Stockings for Runs
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RESISTANCE of silk hosiery to snagging, the cause of most stocking runs, can now be measured by the device pictured below, a development of the U. S. Bureau of Standards.
PopularScience_19400401_0136_004_0058.xml
article
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NEW INVENTIONS
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Identical Gloves Fit Both Hands
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WITH a new type of reversible leather glove, illustrated above either one of a pair may be worn on either the right or the left hand, since the fronts and backs of the gloves are identical. If a glove is lost, it is not necessary to buy a new pair.
PopularScience_19400401_0136_004_0059.xml
article
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NEW INVENTIONS
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Record Gives Music for Story Book
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A “SINGING BOOK” of nursery rhymes for children, just placed on the market, is supplied with a ten-inch, double-face phonograph record that is synchronized with the story. When the record is started on a phonograph, it supplies the Sound effects, sings the verses, and tells the reader following the story in the book just when to turn the pages.
PopularScience_19400401_0136_004_0060.xml
article
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NEW INVENTIONS
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Roller Blotter Works Fast
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FITTED with forty separate layers of blotting paper, a new roller-type desk blotter will blot the entire surface of a written page in a few strokes, without smudging the writing.
PopularScience_19400401_0136_004_0061.xml
article
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NEW INVENTIONS
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Ring Has Hinged Setting
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CONCEALED names, initials, or a short written sentiment can be built into a new type of wedding ring now available. As shown above, the outer diamond setting is hinged to swing open and reveal the letters ordinarily hidden below it.
PopularScience_19400401_0136_004_0062.xml
article
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NEW INVENTIONS
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Paint Shatterproofs Ordinary Glass
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WHEN applied over ordinary glass, a new transparent paint now being produced in England is said to prevent the glass from splintering if accidentally broken. When struck by a heavy mallet, as pictured above, the paint-treated glass cracks but does not split up into loose splinters as ordinary glass would do.
PopularScience_19400401_0136_004_0063.xml
article
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57,58,59,60,61,62,63,64
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How Science Puts Color to Work
Industry, Business, and Medicine Are Making Use of the Rainbow
TEST YOUR PERSONALITY WITH COLORS
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ROBERT E. MARTIN
AT A western hospital, not long ago, attendants wheeled a patient into the psychopathic ward. He was weak, emaciated, hardly able to speak above a whisper. Doctors were afraid he would starve himself to death. “I won’t eat!” he kept repeating stubbornly.
PopularScience_19400401_0136_004_0064.xml
article
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NEW INVENTIONS
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Vibrating Curling Iron Waves Any Kind of Hair
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SUCCESSFUL results are said to be assured in curling dry, oily, straight, kinky, or practically any other type of hair, with a new waving machine just introduced. Powered by electricity, the device employs a vibrating curling iron that can be regulated to four different heats so that the proper temperature can be obtained for any type of hair.
PopularScience_19400401_0136_004_0065.xml
article
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Chemists May Make Rain
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RAIN may someday be produced by chemical means in periods of drought, under a plan proposed by two Hungarian scientists. Gaseous, liquid, or solid fuels, placed in containers on the soil or on the surface of lakes, would be ignited by electricity, causing rapidly rising masses of hot air that would result in showers of rain.
PopularScience_19400401_0136_004_0066.xml
article
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AVIATION
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Elevator Racks Speed Up Plane Building
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LADDERS, scaffolding, and other rigging are not necessary for assembling planes in a Long Island aircraft factory which has installed novel new elevator racks in its production line. Mechanics stand at floor level to work on a plane, using the lift to raise or lower the ship to the most convenient height.
PopularScience_19400401_0136_004_0067.xml
article
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PHOTOGRAPHY
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Color Pictures of Flying Plane Made at Night
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To MAKE color photographs at night of a plane in flight, Private Leslie Bland, U. S. Army photographer at Randolph Field, Tex., used the odd lighting set-up pictured at the left. Flying in an accompanying plane, Bland arranged a cluster of four photoflash bulbs and reflectors around his camera to provide adequate illumination for the night shot.
PopularScience_19400401_0136_004_0068.xml
article
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MODELS
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Model-Railroad Builders Get Handy O-Gauge Rule
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MADE of stainless steel, a handy rule for model-railroad builders who work in O gauge is now available. One edge of the rule is marked in scale feet on the usual O-gauge scale of a quarter inch to one foot, while the other edge shows scale feet on the alternative O-gauge scale of seventeen sixtyfourths of an inch to one foot.
PopularScience_19400401_0136_004_0069.xml
article
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UNUSUAL FACTS AND IDEAS
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Odd Ventilator Pumps Pure Air to Bomb Cellar
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KNOWING that poison gas seldom rises more than thirty feet above ground level, a British inventor worked out an odd device designed to draw fresh air into gasproof shelters on or under the ground. Resembling a giant accordion, a special hand-operated bellows sucks fresh air into the shelter through a flue pipe that extends up forty feet above the ground.
PopularScience_19400401_0136_004_0070.xml
article
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UNUSUAL FACTS AND IDEAS
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ICE-BOAT PILOT RIDES INSIDE THE SAIL
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ENTERING through a small door in the side, J. L. Finch, of Patchogue, N. Y., drives his curious ice boat, pictured above, from within a fixed, fabric-covered airfoil that serves as a sail for the craft. Instead of controlling his ice racer by manipulating a sail, Finch turns the forward movable runners on which the boat rides to get it into the mostadvantageous position in the prevailing wind.
PopularScience_19400401_0136_004_0071.xml
article
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68,69
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Odd Jobs for Your Phonograph
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WHAT will put you to sleep, wake you up, improve your hearing, and teach you card tricks, foreign languages, or duck calls? Simple enough—your phonograph. New disks make it a jack-of-all-trades to serve your need or fancy. An innovation for curing insomnia is a twelve-inch record, recently placed on the market.
PopularScience_19400401_0136_004_0072.xml
article
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NEW INVENTIONS
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Metal Life Preserver Holds Food and Water
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MADE entirely of metal, a life preserver capable of keeping six persons afloat indefinitely has been offered recently for use in the British Navy. Water-tight compartments built into the device are stocked with emergency rations and fresh drinking water to sustain the persons supported by it until help arrives.
PopularScience_19400401_0136_004_0073.xml
article
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AVIATION
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Giant Electric Sign Is Carried by Plane
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CALLED the largest of its kind in the world, a flying electric advertising sign is suspended beneath the lower wing of a large transport plane. Designed to be read at an altitude of 3,000 feet, the sign is of the “traveling” type—complete sentences travel across its face in moving letters as lights are switched on and off by means of an intricate control mechanism installed within the plane fuselage.
PopularScience_19400401_0136_004_0074.xml
article
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UNUSUAL FACTS AND IDEAS
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Keeps Air-Raid Map Under His Hat
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ALTHOUGH not quite so good as a steel helmet, the black derby hat owned by an Englishman living on the east coast is a handy headpiece to have along in the event of an enemy air raid. For inside of his bowler, this Britisher has pasted a map on which the location of local air-raid shelters is plainly marked.
PopularScience_19400401_0136_004_0075.xml
article
72
72
UNUSUAL FACTS AND IDEAS
[no value]
Sailors Refit Old Square-Rigged Ship
[no value]
[no value]
[no value]
[no value]
FORCED from their regular jobs by the curtailment of foreign shipping, a group of American merchant seamen are now hard at work remodeling and refitting the Tusitala, the only surviving American square-rigged merchant ship. Rescued from the waterfront yards of a New England scrap dealer, the graceful vessel was tied up at Staten Island, New York City, where more than 100 seamen are now putting the square-rigger back into shape. The Tusitala has not put out to sea in over seven years, although, decades ago, she plied a regular run to Hawaii in the molasses trade.
PopularScience_19400401_0136_004_0076.xml
article
73
73
UNUSUAL FACTS AND IDEAS
[no value]
Bulletless Rifle Practice Improves Aim
[no value]
[no value]
[no value]
[no value]
No BULLETS or powder are needed for an odd type of rifle practice demonstrated by British soldiers in the photograph above. A sergeant, seen at the right, holds a tiny target in front of one eye, and looks through a peep hole in the center to check the soldier’s aim by seeing that his gun sights line up with the bull’s-eye.
PopularScience_19400401_0136_004_0077.xml
article
73
73
[no value]
[no value]
Mechanical Calculator Aids Plane Designers
[no value]
[no value]
[no value]
[no value]
WORKING from data gained in extensive wind-tunnel tests with model arplanes, Lewis L. Imm, California inventor, has developed an automatic computing machine that should simplify the calculating chores of airplane designers, operators, and pilots.
PopularScience_19400401_0136_004_0078.xml
article
73
73
[no value]
[no value]
Woman Invents Process for Curing Tobacco
[no value]
[no value]
[no value]
[no value]
SPEEDY curing of tobacco is said to be accomplished by a new process worked out by a Cleveland, Ohio, chemist, Jacqueline S. Front. Although details of the new treatment have not been revealed, it is reported that cigar tobacco can be completely cured in the space of a few hours, instead of the weeks and sometimes months required by present methods.
PopularScience_19400401_0136_004_0079.xml
article
74
74
UNUSUAL FACTS AND IDEAS
[no value]
Freckleproof Cape Protects Bather
[no value]
[no value]
[no value]
[no value]
FAIR Floridians who fear freckles have adopted the odd hooded cape pictured in the photograph below, taken at an Atlantic beach resort. Made of a polka-dot print fabric, the freckleproof cape has an attached hood equipped with builtin sun glasses to further protect the wearer from the effects of strong sunlight.
PopularScience_19400401_0136_004_0080.xml
article
74
74
UNUSUAL FACTS AND IDEAS
[no value]
Periscope Is Built into Dugout
[no value]
[no value]
[no value]
[no value]
TAKEN “somewhere in France,” the photograph above shows a soldier attached to a Scots regiment on watch in an underground concrete shelter. Using a built-in periscope, the sentry can scan the area on all sides of the sunken dugout, and obtain a clear view of any advance of the enemy without exposing himself to the fire of snipers or enemy patrols.
PopularScience_19400401_0136_004_0081.xml
article
74
74
HEALTH AND HYGIENE
[no value]
Cough Drop Has Liquid Center
[no value]
[no value]
[no value]
[no value]
COUGH DROPS that have liquid cough medicine in their centers are now on the market. In manufacturing the remedy, a teaspoonful of a cough sirup is placed within a hollow candy shell, and the open edge of the latter is sealed. The shell dissolves in the mouth of the user, releasing the cough sirup.
PopularScience_19400401_0136_004_0082.xml
article
74
74
UNUSUAL FACTS AND IDEAS
[no value]
Ants Keep Homes Cozy by Air-Conditioning
[no value]
[no value]
[no value]
[no value]
ANT HILLS are kept at comfortable temperatures by air-conditioning crews which open and close ventilating passages at morning and night, according to Mutsuo Katô, of Tokyo, Japan. Eighty to eighty-four degrees F. is the ants’ idea of comfort.
PopularScience_19400401_0136_004_0083.xml
article
75
75
NEW INVENTIONS
[no value]
Pipe Smokers Get Lighters
[no value]
[no value]
[no value]
[no value]
DESIGNED especially for pipe smokers, a new mechanical lighter now on the market throws a jet of flame directly into the bowl of a pipe, as shown in the illustration above. A standard wheel, flint, and wick assembly produces a flame as in conventional lighters.
PopularScience_19400401_0136_004_0084.xml
article
75
75
AUTOMOBILES
[no value]
Gas Bag on Roof Holds Bus Fuel
[no value]
[no value]
[no value]
[no value]
MOUNTED on the roof tops of English busses, balloonlike fabric bags are serving as reservoirs for coal gas, a fuel now in general use as a substitute for gasoline. In the photograph reproduced above, coal gas is being piped into the roof-top balloon reservoir of a bus before the vehicle starts off on a scheduled run.
PopularScience_19400401_0136_004_0085.xml
article
75
75
UNUSUAL FACTS AND IDEAS
[no value]
Dog Leash from Parachute Cord
[no value]
[no value]
[no value]
[no value]
ABOUT the diameter of a shoe string, a dog leash made of silk of the type employed for parachute shroud lines weighs less than two ounces but is said to be strong enough to tether a horse. The idea for the lightweight leash occurred to Vernon D. Smith, a jobless Californian, when, on visiting a Burbank parachute factory, he found some odds and ends of parachute shroud lines in a factory trash box.
PopularScience_19400401_0136_004_0086.xml
article
76
76,77,78,79,231
[no value]
[no value]
UNCLE SAM grooms his HELL BUGGIES
A CLOSE-UP VIEW OF OUR HARD-HITTING TANK FORCE
[no value]
[no value]
ARTHUR GRAHAME
ONE cold morning this winter I stood in a big, open field at Fort Hoyle, Md., talking about tanks with Lieut.-Col. B. G. Chynoweth, who commands the First Battalion of the 66th Infantry, the Regular Army light-tank regiment which traces its history back to the American Tank Brigades which fought in Belgium and in the Argonne two decades ago.
PopularScience_19400401_0136_004_0087.xml
article
80
80
AVIATION
[no value]
There's Music in the Air for Airplane Travelers
[no value]
[no value]
[no value]
[no value]
AS THEY fly to their destinations, passengers on planes of a major transcontinental air line can now listen to broadcast radio programs. Stations are tuned in on a master set and the programs are piped to individual loudspeakers housed in padded units that hang over the seat backs of those passengers who desire to listen in.
PopularScience_19400401_0136_004_0088.xml
article
80
80
HEALTH AND HYGIENE
[no value]
Kachoo! Now It's a Mechanical Sneezer
[no value]
[no value]
[no value]
[no value]
INFECTIOUS germs are spouted from the mouth of a mechanical sneezer developed for medical research by William F. Wells of the University of Pennsylvania medical school in Philadelphia. By means of compressed air, the apparatus blows air-borne germs through a tube into a glass bell housing an experimental rabbit, to simulate the common method of transmission of germs by human sneezers and coughers.
PopularScience_19400401_0136_004_0089.xml
article
81
81
UNUSUAL FACTS AND IDEAS
[no value]
WHEN YOU CLIMB. . Don't Look Up!
[no value]
[no value]
[no value]
[no value]
YOUR muscles flutter, your brain reels, you lose control of your nerve—and you are in grave danger of a fatal fall. That’s what can happen when you climb tall structures and violate the two simple rules that steeple jacks, steel workers, painters, and other professional climbers use to prevent the hazards of dizziness.
PopularScience_19400401_0136_004_0090.xml
article
82
82
UNUSUAL FACTS AND IDEAS
[no value]
Model-Airplane Motor Drives Scooter
[no value]
[no value]
[no value]
[no value]
UP TO 230 miles on a gallon of gasoline is the economical fuel-consumption rate of a curious motorized scooter constructed by E. Roberts, of Philadelphia, Pa. Converted from a toy motor cycle, the midget vehicle is driven by a one-fifthhorsepower model-airplane engine, acting on the front rubbertired wheel through a spring-supported friction roller. Fifteen miles an hour is top speed on level ground.
PopularScience_19400401_0136_004_0091.xml
article
82
82
NEW INVENTIONS
[no value]
Novel Pencil Sharpener Runs by Electricity
[no value]
[no value]
[no value]
[no value]
DESIGNED as an improvement on the familiar hand-cranked desk model, a new pencil sharpener is operated by electricity. As pictured in the photograph at the left, a pencil to be sharpened is placed in the opening at the top of the unit’s dustproof, dome-shaped housing.
PopularScience_19400401_0136_004_0092.xml
article
82
82
NEW INVENTIONS
[no value]
Pads Remove Nail Polish
[no value]
[no value]
[no value]
[no value]
MANICURE pads for removing old nail polish have been recently placed on the market. Made of absorbent material, the soft pads are impregnated with a special chemical solvent. When the pad is rubbed over the nail, the solution softens the old polish, which can then be easily wiped off with the absorbent pad itself.
PopularScience_19400401_0136_004_0093.xml
article
83
83
AVIATION
[no value]
How the U. S. Coast Guard Tries Out a New Plane
[no value]
[no value]
[no value]
[no value]
HANDLING in rough weather, maneuverability, fuel consumption, take-off and landing areas required, and maximum speed are among the many tests that U. S. Coast Guard experts give new airplanes before accepting them for service. In these photographs, taken at Floyd Bennett Field, New York City, Coast Guard technicians are shown putting a twin-motored amphibian through its paces before acceptance.
PopularScience_19400401_0136_004_0094.xml
article
84
84,85,86,87,88
[no value]
[no value]
BOY'S HOBBY CREATES Puppet Opera
[no value]
[no value]
[no value]
ARTHUR A. STUART
THIRTEEN years ago, in a Chicago basement, a twelveyear-old schoolboy, Ernest Wolff, began experimenting with puppets synchronized with opera recordings. His stage was an old apple crate, draped with cloth from his mother’s sewing box; his illumination, a string of lights from the Christmas tree; his puppets, ordinary dolls.
PopularScience_19400401_0136_004_0095.xml
article
89
89
NEW INVENTIONS
[no value]
Cellar Periscope Shows Gas Meter
[no value]
[no value]
[no value]
[no value]
THE gas man won’t track dirt through your kitchen to the cellar door any more if your house is equipped With the novel device shown above. Actually a periscope, it is attached outside the house with the lower end against a hole in the foundation.
PopularScience_19400401_0136_004_0096.xml
article
89
89
HEALTH AND HYGIENE
[no value]
Riding and Rowing Machine in One
[no value]
[no value]
[no value]
[no value]
SAID to provide the healthy exercise of both rowing and horseback riding, a new machine, shown in use above, has hinged handlebars, foot rests, and seat which move through arcs to simulate the beneficial motions of both sports. A hydraulic piston provides resistance.
PopularScience_19400401_0136_004_0097.xml
article
89
89
HEALTH AND HYGIENE
[no value]
"Death Cabinet" Kills Germs on Drinking Glasses
[no value]
[no value]
[no value]
[no value]
DRINKING glasses placed in the cabinet at the left after washing are kept sanitary until removed, according to the manufacturer of the device. Designed for restaurant use, the glass-lined cabinet contains “cold-light” electric lamps which give off rays that kill diseasespreading germs that might linger on the rims or inside of the glasses while they are not in use.
PopularScience_19400401_0136_004_0098.xml
article
90
90,91,92
[no value]
[no value]
HARNESSING Hurricanes of Steam
[no value]
[no value]
[no value]
[no value]
RISING to a crescendo of sound so loud that a man cannot hear himself yell, the shriek of a dozen hurricanes fills a laboratory at Schenectady, N. Y. A pair of General Electric research engineers, wearing plugs in their ears, talk to each other only in sign language.
PopularScience_19400401_0136_004_0099.xml
article
93
93
UNUSUAL FACTS AND IDEAS
[no value]
Bikes Save Time at Navy Testing Basin
[no value]
[no value]
[no value]
[no value]
SO BIG that the Government has furnished four bicycles for the use of the scientific and operating staffs in getting from one point to another along the walks besides its indoor waterways, the U. S. Navy’s giant ship-testing basin at Carderock, Md., (P.S.M., Jan. ’38, p. 36) is as long as four football fields laid end to end.
PopularScience_19400401_0136_004_0100.xml
article
93
93
NEW INVENTIONS
[no value]
New Table-Top Golf Game
[no value]
[no value]
[no value]
[no value]
A PENCIL substitutes for a club in a novel table golf game recently introduced. The player, blindfolded with a black mask, makes “shots” by drawing a line from the tee in the direction of the green on a course marked off on a pad made of transparent cellulose material.
PopularScience_19400401_0136_004_0101.xml
article
94
94
AUTOMOBILES
[no value]
They Travel To Keep Motorists Posted
[no value]
[no value]
[no value]
[no value]
LIVING like gypsies in their own trucks, signpost crews of the Automobile Club of Southern California have erected 500,000 signs of 125 types in their area. They cover 200,000 miles a year, posting 50,000 signs annually to keep abreast of changing road conditions.
PopularScience_19400401_0136_004_0102.xml
article
94
94
UNUSUAL FACTS AND IDEAS
[no value]
Big Kilns Make Cement for Dam
[no value]
[no value]
[no value]
[no value]
BUILT especially for the job, giant rotary kilns now in operation at the construction site of the huge Shasta Dam in California, convey an idea of the immensity of the project. Twelve feet in diameter, each of the two rotary kilns is able to turn out 7,000 barrels of cement a day to meet the expected total requirement of 5,800,000 barrels of cement for the complete dam.
PopularScience_19400401_0136_004_0103.xml
article
95
95
AUTOMOBILES
[no value]
Road Test
[no value]
[no value]
[no value]
BERTON BRALEY
It’s a thought to suggest That the acidest test Of your worst—or your best— Is a car. When you sit at the wheel Of an automobile, You are bound to reveal What you are! Though afoot you may bluff With Lord Chesterfield stuff, If you act like a tough When you tour, Well, it cracks your veneer Of good manners, it’s clear, And you plainly appear As a boor.
PopularScience_19400401_0136_004_0104.xml
article
96
96
UNUSUAL FACTS AND IDEAS
[no value]
Earth's History in 300-Foot Painting
[no value]
[no value]
[no value]
[no value]
A HISTORY of the earth from the beginnings of time, in one gigantic block-long painting, was a high spot in a recent exhibit of mineral lore held in Los Angeles, Calif. In planning the mammoth canvas, the artists discovered that if an ordinary arithmetical scale were used, the whole history of man would take up only two inches.
PopularScience_19400401_0136_004_0105.xml
article
96
96
AUTOMOBILES
[no value]
Adjustable Generator for Small Planes
[no value]
[no value]
[no value]
[no value]
INCASED in a streamline housing, a new type of wind-driven generator for small airplanes has blades that can be adjusted to various pitches to increase or decrease the turning rate and power generation. The blades are locked onto the main shaft by means of a special type of set screw which makes it practically impossible for them to fly off.
PopularScience_19400401_0136_004_0106.xml
article
97
97
MODELS
[no value]
Machine Makes Track for Model Railroads
[no value]
[no value]
[no value]
[no value]
RAILS and ties are assembled automatically without the use of spikes by a novel machine invented by Fred J. Chemidlin, of Scotch Plains, N. J., to manufacture track for model-railroad enthusiasts. Resembling an old-fashioned sewing machine, the device turns the finished product out in a steady stream. Although the original machine was hand-powered, a new type is powered by electricity.
PopularScience_19400401_0136_004_0107.xml
article
97
97
NEW INVENTIONS
[no value]
Device Puts Printing on Wrapping Tape
[no value]
[no value]
[no value]
[no value]
PRINTING is applied to the adhesive face of transparent cellulose tape as the latter is fed from a new counter-top dispensing device. Changeable printing wheels bearing different messages do the work.
PopularScience_19400401_0136_004_0108.xml
article
97
97
AUTOMOBILES
[no value]
Dolly Eases Big Tire Jobs
[no value]
[no value]
[no value]
[no value]
CHANGING huge truck wheels for tire repair or replacement is made easy by a new mechanical wheel dolly. With the apparatus, pictured above, one man can easily remove a doublewheel assembly and transport it to any part of a repair shop.
PopularScience_19400401_0136_004_0109.xml
article
98
98
UNUSUAL FACTS AND IDEAS
[no value]
OLD AUTO HEADLIGHTS MADE INTO FANCY BOWLS
[no value]
[no value]
[no value]
[no value]
WHEN time began to hang heavy on the hands of sixtytwo-year-old Leo Giesecke, retired Houston, Tex., sheet-metal worker, he conceived the idea of fashioning decorative bowls and vases from the reflector shells of junked automobile headlights.
PopularScience_19400401_0136_004_0110.xml
article
99
99
MODELS
[no value]
Model Circus Is Big Show in Miniature
[no value]
[no value]
[no value]
[no value]
FIFTY railroad cars, twenty-five tents, 100 wagons, forty-five different kinds of animals, and thousands of individual performers make up an amazing miniature circus that has been the sparetime hobby of Horace S. Williams, of Falconer, N.Y., for twenty-five years.
PopularScience_19400401_0136_004_0111.xml
article
99
99
HEALTH AND HYGIENE
[no value]
Rub Lather In, Fat Out, With Rolling-Pin Soap
[no value]
[no value]
[no value]
[no value]
SOAP made in the form of a rolling pin is a novel bath accessory recently placed on the market. The cylinder of soap, weighing one pound, is fitted with wooden handles, making it easy for the bather to roll off excess fat while working up a lather by wielding the unit as pictured at the left.
PopularScience_19400401_0136_004_0112.xml
article
100
100
UNUSUAL FACTS AND IDEAS
[no value]
Perfume Advertised in Perfumed Ink
[no value]
[no value]
[no value]
[no value]
A COLOR advertisement that smelled, but smelled beautifully, was printed recently in an Indianapolis, Ind., newspaper to promote the sale of a new perfume. To accomplish this novel feat, green printer’s ink was scented by adding concentrated perfume oil, and applied to the page on which the advertisement appeared by means of a special “ink fountain” of the type used to print a color on a single page of a large newspaper.
PopularScience_19400401_0136_004_0113.xml
article
101
101
UNUSUAL FACTS AND IDEAS
[no value]
Surfboards of Cloth
[no value]
[no value]
[no value]
[no value]
RIDING the ocean breakers on surfboards made of cloth is a novel sport that is becoming popular at a California beach resort. Looking like a giant’s pillowcase, the “boards” are made from four yards of good-quality muslin, which becomes air-tight when wet.
PopularScience_19400401_0136_004_0114.xml
article
102
102,103,104,105
[no value]
[no value]
Make-Believe Fires
TRAIN MEN FOR SALVAGE PATROL
[no value]
[no value]
KENNETH M. SWEZEY
CLANG-CLANG-CLANG! A fire-alarm gong rings in an upper floor of a New York City building. Rubber-coated, leather-helmeted firemen carrying crowbars, emergency lights, and heavy tarpaulins rush onto an improvised stage decked out with painted scenery “flats” representing the walls of a two-room apartment.
PopularScience_19400401_0136_004_0115.xml
article
106
106
UNUSUAL FACTS AND IDEAS
[no value]
Hoop Replaces Badminton Net
[no value]
[no value]
[no value]
[no value]
SHUTTLECOCKS must be hit through a mid-court wire ring, instead of over a net, in a novel form of badminton worked out by C. N. Boroughs, of Atlanta, Ga. Players stay within their respective playing courts, which measure nine by twelve feet, and stroke the badminton bird through the center ring into the opposing court.
PopularScience_19400401_0136_004_0116.xml
article
106
106
HEALTH AND HYGIENE
[no value]
Bed Tongs Retrieve Objects from Floor
[no value]
[no value]
[no value]
[no value]
INVALIDS, or others confined to their beds, find it easy to retrieve objects dropped on the floor with the aid of the wooden bed tongs pictured below. About three feet long, the tongs resemble and operate like an elongated pair of shears. The tong tips are fitted with small rubber pads to prevent objects from slipping out of their grip after they have been grasped properly.
PopularScience_19400401_0136_004_0117.xml
article
106
106
UNUSUAL FACTS AND IDEAS
[no value]
Toy Miner's Lamp in Hat
[no value]
[no value]
[no value]
[no value]
A CHILDREN'S version of a miner’s hat lamp, recently introduced, is made of cardboard and includes batteries and a light bulb that turns on when the hat is put on and off when it is removed.
PopularScience_19400401_0136_004_0118.xml
article
106
106
AVIATION
[no value]
Shoulder Safety Straps
[no value]
[no value]
[no value]
[no value]
SHOULDER straps developed by the U. S. Army Air Corps for use with regular safety belts are designed to prevent head and neck injuries to pilots by preventing their heads from bumping against the plane’s instrument panel when a crack-up occurs.
PopularScience_19400401_0136_004_0119.xml
article
107
107
AUTOMOBILES
[no value]
Hose Nozzle Is Soap-Spray Gun
[no value]
[no value]
[no value]
[no value]
AUTOMOBILES are washed with a minimum of time and effort with the aid of a new water-hose attachment. Replacing the regular hose nozzle, the new unit incorporates a special soap cartridge producing a greasedissolving, grit-removing spray.
PopularScience_19400401_0136_004_0120.xml
article
107
107
AUTOMOBILES
[no value]
Shields Make Fog Lights of Any Car's Headlamps
[no value]
[no value]
[no value]
[no value]
FOR driving in fog, an orange-tinted plastic shell just developed slips over the lens of an automobile headlight and is held in place by elastic rubber bands. It is claimed that the tinted shields increase visibility when driving through fog, because the colored light they give off does not produce the glare created when white light is reflected by the droplets of water that form a mist.
PopularScience_19400401_0136_004_0121.xml
article
107
107
UNUSUAL FACTS AND IDEAS
[no value]
Novel Electric Guide Map
[no value]
[no value]
[no value]
[no value]
PRESSING a button illuminates the site of a selected point of interest on a novel electric map guide set up for the convenience of out-of-town visitors at a large New York City hotel.
PopularScience_19400401_0136_004_0122.xml
article
108
108
AUTOMOBILES
[no value]
Puppet Show Drives Home Driving Rules
[no value]
[no value]
[no value]
[no value]
A TRAVELING marionette show, mounted on a truck chassis, has been put to use by a large oil company in a national campaign against reckless driving. The villain of its cast, a confirmed breaker of traffic rules, demonstrates with a miniature car how eccentric driving will snarl traffic and set the stage for serious accidents. He receives a verbal dressing-down from a policeman, who impresses the rules of safe driving upon the audience.
PopularScience_19400401_0136_004_0123.xml
article
108
108
NEW INVENTIONS
[no value]
Novel Belt "Breathes" To Give New Comfort
[no value]
[no value]
[no value]
[no value]
MEN’S belts that “breathe,” expanding and contracting as their wearers inhale and exhale, are declared to offer added comfort. Instead of being fastened so that it will not give, the buckle is anchored to the belt by a pair of small coil springs, and these provide the proper amount of play.
PopularScience_19400401_0136_004_0124.xml
article
109
109
UNUSUAL FACTS AND IDEAS
[no value]
Pontoons Support Odd Fishing Boat
[no value]
[no value]
[no value]
[no value]
PONTOONS made of welded sections of steel float a unique boat constructed by students in an Oakland, Calif., school of welding for use as a fishing craft for large parties of anglers on San Francisco Bay. Powered by two 110-horsepower gasoline engines, one installed in the stern section of each pontoon, the odd boat will have a speed of about twenty knots.
PopularScience_19400401_0136_004_0125.xml
article
110
110
UNUSUAL FACTS AND IDEAS
[no value]
Molecules May Be "Left-Handed"
[no value]
[no value]
[no value]
[no value]
WITH the thumbs of boxing gloves, Dr. H. H. Strain, of the Carnegie Institution, Washington, D. C., illustrates in the photograph above the fact that molecules can be either left or right-handed, a peculiar property being explored in current studies.
PopularScience_19400401_0136_004_0126.xml
article
110
110
NEW INVENTIONS
[no value]
Tobacco Pouch Snaps Shut by Itself
[no value]
[no value]
[no value]
[no value]
WHEN pulled open by means of two leather tabs, the mouth of a tobacco pouch recently developed remains wide open while the user fills his pipe, and then, in response to slight pressure with one hand, snaps shut to make an airtight seal. Flat strips of springy metal that line the pouch opening do the trick.
PopularScience_19400401_0136_004_0127.xml
article
110
110
PHOTOGRAPHY
[no value]
Camera Gets Movies of Fiery Furnace
[no value]
[no value]
[no value]
[no value]
PHOTOGRAPHING the interior of a fiery furnace to determine combustion efficiency is now made practicable by a novel apparatus designed by Fred Davidson, director of research of the New York Edison Co., of New York City. The unit consists of a long water-cooled tube fitted with two quartz windows at one end.
PopularScience_19400401_0136_004_0128.xml
article
111
111
NEW INVENTIONS
[no value]
Vacuum Process Gives Better Mirrors
[no value]
[no value]
[no value]
[no value]
DEPOSITED electrically in a high vacuum onto practically any type of surface, a new metal-alloy coating for mirrors can be applied in minute thicknesses. Using this process, a California laboratory recently filled an order for 100 perfect mirrors, one twentyfifth of an inch long and one fiftieth of an inch wide, on glass four thousandths of an inch thick.
PopularScience_19400401_0136_004_0129.xml
article
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112,113
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Calling the Close Ones
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WHEN 30,000 throats bellow “Robber! Thief! Blind man!” from the stands at a baseball park, the fans can mean only one man: the umpire. But ninety-nine times out of 100, he’s right, and the fans are wrong. Calling the close ones is his job, and if you think you can beat him at it, study the close decisions in the photographs on this page, call ’em as you see ’em, and turn to page 233 for the right answers.
PopularScience_19400401_0136_004_0130.xml
article
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114
AUTOMOBILES
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Street-Light Analyzer Is Mobile Unit
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How effective are various types of street lighting? To answer this question, General Electric research engineers have devised an ingenious mobile “lighting evaluator.” A miniature reproduction of the pavement surface of the lighted road being tested is mounted on the hood of an automobile, above the level of beams from headlamps of approaching cars.
PopularScience_19400401_0136_004_0131.xml
article
114
114
NEW INVENTIONS
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Magnets Hold False Teeth in Place
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MAGNETS help to keep false teeth in place in the wearer’s mouth, under a system devised by a New York City dentist. Placed near the back of each set and concealed by porcelain sheaths, the magnets in the upper plate repel those in the lower to steady the teeth in the mouth and keep them from falling out.
PopularScience_19400401_0136_004_0132.xml
article
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115
UNUSUAL FACTS AND IDEAS
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Odd Magnetic Rake Gathers Meteorites
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HARVESTING meteorites with a magnetic rake has recently been proved practical by two scientists of southern California. Towed behind a moving automobile, the rake employs four powerful U-shaped electromagnets energized by a storage battery.
PopularScience_19400401_0136_004_0133.xml
article
115
115
NEW INVENTIONS
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Toy Actors Strut Stage in "Mystery" Theater
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IN A “mystery” toy theater, comic figures made of wood walk either forward or backward across the stage, without the benefit of winding or mechanism of any kind. The actors also perform as well outside the theater, on any inclined board, for the secret of their ability is that they move by gravity.
PopularScience_19400401_0136_004_0134.xml
article
116
116,117,118,119,235
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Foiling the Gold Thieves
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STERLING GLEASON
THEY called it a “dude” mine because every man underground had to wear safety-toed shoes and a hard hat. “Cold serum” shots were free for the asking, and the milling machinery was the latest and best. A huge safe guarded the choice specimens of ore, the rich concentrates from the flotation machines.
PopularScience_19400401_0136_004_0135.xml
article
120
120
NEW INVENTIONS
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Light-Diffusing Lens Edges Make Eyeglasses Invisible
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SPECTACLES with lenses that are practically invisible while being worn have just been made available. The effect is accomplished by means of polished facets on the lens edges, designed to diffuse and scatter the reflections of light striking them, thus making the lens edges difficult to see. Some types also have an inlay at the top of the lenses,designed to blend in with the eyebrow line.
PopularScience_19400401_0136_004_0136.xml
article
120
120
NEW INVENTIONS
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“Suitcases“ Hold Television Pick-Up
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COMPACTNESS and portability are two of the outstanding features of a suitcase television transmitter designed and constructed recently by research engineers of the Radio Corporation of America. Developed as a substitute for mobile television equipment mounted in special trucks, the new outfit is planned for use in picking up programs at remote points for relay to central transmitting stations.
PopularScience_19400401_0136_004_0137.xml
article
121
121
AVIATION
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Magnetic Cables Guide Planes to Blind Landings
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RAIN, fog, or other adverse weather conditions have no effect whatsoever on a new magnetic blind-landing system for airplanes, developed by U. S. Navy experts and installed not long ago at the Naval Air Station at Lakehurst, N. J. Bringing his ship in for a landing, a Navy pilot watches magnetic pointer needles on the face of a dial installed on the instrument panel.
PopularScience_19400401_0136_004_0138.xml
article
122
122,123
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Everybody Rows at Novel Aquatic School
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ANDREW R. BOONE
IN BOATS ranging from practice barges to famous racing shells, 750 amateur oarsmen bend to the oars each week in a training school maintained on Marine Stadium by the City of Long Beach, Calif. Six different groups practice on the narrow waterway, from boys of junior-high-school age to adults who row occasionally for pleasure.
PopularScience_19400401_0136_004_0139.xml
article
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124,125
Handy Helps for Homemakers
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NEW HOUSEHOLD APPLIANCES
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PopularScience_19400401_0136_004_0140.xml
article
126
126
NEW INVENTIONS
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Food Pops Out of Table Tops in Cafeteria
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FOOD ordered by customers in a novel automatic restaurant recently proposed by a hotel man, pops up out of the center of each table. On entering the restaurant, the diner sits at a table having in its center what appears to be merely a tray. To order his meal, he checks off items of a special card provided for the purpose, which he then drops through a handy slot in the table.
PopularScience_19400401_0136_004_0141.xml
article
126
126
MODELS
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Rubber Bands Power Model Helicopter
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DESIGNED to set a new sustained-flight record, the model helicopter pictured at the right was demonstrated at a recent modelairplane meet. Powered by elastic bands, the model employs two propellers that whirl in opposite directions. An extension at the top of the craft’s stick body prevents the propellers from fouling on the ceiling when the model is flown indoors.
PopularScience_19400401_0136_004_0142.xml
article
126
126
UNUSUAL FACTS AND IDEAS
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Midget Watch Clips to Cuff
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A WATCH that can be worn on a shirt cuff, necktie, or vest-pocket rim is a novelty recently marketed. Fitted with a clip that holds it in place securely, the timepiece can also be used by women as an ornament for a hand bag or on a dress.
PopularScience_19400401_0136_004_0143.xml
article
127
127
The Man with the Net
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The Man with the Net
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DRONE HONEYBEES have grandfathers but no fathers. TWELVE STATES have laws against driving an automobile too slowly. ALCOHOL was once the name of a solid mineral. WOMEN can hear high tones better than men—and men, as a rule, can hear low tones better than women.
PopularScience_19400401_0136_004_0144.xml
article
127
127
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Handy Nail-Polish Guards
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POLISH newly applied to finger nails may be protected from accidental smearing as it dries with novel ventilated finger-nail guards just introduced for beauty-shop and home use. Made of springy metal, the guards are slipped on over the ends of the fingers, as shown in the photograph above, and are held in place by elastic bands.
PopularScience_19400401_0136_004_0145.xml
article
127
127
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Three-Hole Paper Punch
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THREE correctly spaced holes can be cut at the same time in paper used for loose-leaf folders or notebooks, by means of a compact hand punch now available. Used as shown below, the punch fits easily into a briefcase or desk drawer.
PopularScience_19400401_0136_004_0146.xml
article
128
128
HELPS FOR CAMERA AMATEURS
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"Wire-Photo" Cameramen Get Portable Darkroom
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To SPEED news pictures onto the wires for transmission to cities from remote places, the photographers of one news-picture agency are equipped with the portable developing and enlarging outfit shown in use in the accompanying photograph.
PopularScience_19400401_0136_004_0147.xml
article
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128
HELPS FOR CAMERA AMATEURS
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Automatic Electric Drier Avoids Brittle Prints
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ELECTRICALLY regulated to give a safe amount of heat that its manufacturer claims will prevent paper and emulsion from becoming brittle, the efficient, automatic print drier shown above has a capacity of more than six square feet of drying surface.
PopularScience_19400401_0136_004_0148.xml
article
128
128
HELPS FOR CAMERA AMATEURS
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Twin-Duty Camera Accessory
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A SPLIT-FIELD range finder and an extinction-type exposure meter are now combined in one handy unit that clips on a camera to speed up the making of pictures. Just introduced, the instrument is simple to use. A single knurled wheel is turned to bring the split image together for obtaining the range of the object to be photographed.
PopularScience_19400401_0136_004_0149.xml
article
129
129
HELPS FOR CAMERA AMATEURS
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Single Button Adjusts Camera for Making Any Snapshot
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As A convenient timesaver for snapshooters, a new camera is equipped with a lens diaphragm that is coupled to the setting mechanism of the shutter so that only one adjustment is necessary before taking a picture. For example, when taking a picture on a cloudy day, a button on the front of the camera is moved to a point marked “cloudy.”
PopularScience_19400401_0136_004_0150.xml
article
129
129
HELPS FOR CAMERA AMATEURS
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Thermometer Is Film Agitator
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A HANDY new thermometer with a stainless-steel scale and a transparent housing tells the temperature of the interior of a roll-film tank at the same time that it serves as an agitator. A notch in the lower end engages the spiral-type reel of the tank so that it may be revolved by hand in the usual manner.
PopularScience_19400401_0136_004_0151.xml
article
129
129
HELPS FOR CAMERA AMATEURS
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Portrait Makers Get Spotlight
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DESIGNED for use with either black-and-white or color film, a new spotlight for amateur portrait makers is available. Because of a special lens, its prefocused, 200-watt bulb is said to give an output approximating that of many 500-watt spotlights, while the diameter of its light oeam is easily altered with different bulbs.
PopularScience_19400401_0136_004_0152.xml
article
129
129
HELPS FOR CAMERA AMATEURS
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Photoflash Bulb for Color Film
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COATED with a colorcorrected blue lacquer, a photoflash lamp made especially for use with color film either indoors or out, day or night, is said to get results as good as those obtainable under daylight. It is designed for either synchronized flash guns or the openflash method, and matched to outdoor color films.
PopularScience_19400401_0136_004_0153.xml
article
130
130,239
POPULAR SCIENCE Question Bee
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POPULAR SCIENCE Question Bee
Now It's YOUR Turn!
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In each of the paragraphs below, only one statement is correct; see whether you can pick it out. If you don't go haywire on more than four, you'll be doing well. Answers are given on page 239 1 Indians in the United States (a) have been practically wiped out since the coming of the white man (b) are not nearly half as numerous as in the time of Columbus (c) have recently become the country’s fastestgrowing population group.
PopularScience_19400401_0136_004_0154.xml
article
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131
Un-Natural History
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Un-Natural History
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Gus Mager
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PopularScience_19400401_0136_004_0155.xml
article
132
132,133,134,236
Gus BUILDS AN IGNITION TISTBR
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Gus BUILDS AN IGNITION TISTBR
He's No Carpenter, but the Model Garage Boss Turns Out a Slick Job, Anyhow, Along with Good Ignition Advice
GUS SAYS:
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MARTIN BUNN
"STARTS hard, and stalls in traffic once in a while, hey?” Gus Wilson said: “I guess you know the answer as well as I do, Doc. A hundred to one something has gone wrong in your ignition system.” Dr. Marvin, who in addition to being the town’s top children’s physician is an anthusiastic amateur automobile mechanic, nodded agreement.
PopularScience_19400401_0136_004_0156.xml
article
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135
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THE HOME WORKSHOP
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In This Issue.. Modern Crossbow City-Lot Gardens 18th-Century Secretary Simply Made Enlarger Fireplace Screen
PopularScience_19400401_0136_004_0157.xml
article
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136,137,138
THE HOME WORKSHOP
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"Ye Atom Smasher”... A Modern Crossbow
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GEORGE F. SNELL
FOR the dub archer, hopelessly infected with the romance of medieval weapons, a crossbow should be the answer. A sporting crossbow is easier to make than a really good long bow and is much less difficult to shoot accurately. The cost should not exceed four or five dollars.
PopularScience_19400401_0136_004_0158.xml
article
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139
THE HOME WORKSHOP
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Small Modern Lamp DOES DOUBLE DUTY
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J. BRUMFIELD
CONSTRUCTED of contrasting woods such as maple and walnut or finished in colored enamels, this modern lamp can be used on a table or desk and also hung up as a bed lamp. The base is made in two halves and the center wing swivels on a ¼" dowel. The outside wings are glued in the two halves of the base; then, when the center section is in place, the base is glued together with dowel pins.
PopularScience_19400401_0136_004_0159.xml
article
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139
THE HOME WORKSHOP
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Unique Jewel Box Copied from Old Eskimo Design
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ALTHOUGH it bears a remarkably modernistic design of a salmon, this jewel case is a copy of an old Eskimo trinket box. After the outside has been shaped, the inside of the box can be band-sawed, the entrance kerf through one end being puttied later on.
PopularScience_19400401_0136_004_0160.xml
article
140
140,141
THE HOME WORKSHOP
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18th Century Secretary
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Utility and beauty are combined in this desk, which is a very much simplified version of the Governor Winthrop design
PopularScience_19400401_0136_004_0161.xml
article
142
142
THE HOME WORKSHOP
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Modernistic Wren House Built Up in Layers
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HAZEL F. SHOWALTER
THIS little hanging house for wrens is built of horizontal sections of socalled 1" and ½" white pine, the actual thicknesses of which are about ⅞" and 7/16". The seven middle sections are cut out to form the cavity, and a 1" square entrance is cut through two hollow sections as shown.
PopularScience_19400401_0136_004_0162.xml
article
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142
THE HOME WORKSHOP
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Riveting Parts Lightly
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S. J. GANCHER
Two parts sometimes have to be riveted together lightly so that they will pivot on the rivet as if it were a hinge. This can be done with the aid of a piece of shim stock in the end of which a slot has been cut. Slip this around the rivet between the two parts to be connected, hammer over the rivet until there is no lost motion, and then remove the shim.
PopularScience_19400401_0136_004_0163.xml
article
142
142
THE HOME WORKSHOP
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Window Lock Is Secured with a Thumbscrew
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A. M. C.
THE type of sash lock often used for opened windows, which consists of a rubber-tipped bar hinged to a plate fastened to the upper part of the lower sash, can easily be made tamperproof. Drill and thread a hole ¼" from the finger end of the hinged bar so as to receive a ¾" by 3/16" brass thumbscrew.
PopularScience_19400401_0136_004_0164.xml
article
142
142
THE HOME WORKSHOP
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Unbreakable Insulators for Electric Fence
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K. N. BANTHIN
MANY owners of electric fences have had trouble with broken porcelain insulators, especially in the fence corners. These may be replaced with pieces of old automobile tire casing on which some of the grooving is still present. The bead is cut off all around the tire on both sides, and then the tire is cut up into sections from 6" to 9" long and nailed to the posts so that the wire can be fastened in the center groove by means of small wires in the cas ing.
PopularScience_19400401_0136_004_0165.xml
article
143
143
THE HOME WORKSHOP
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Heavy Lathe Tools Bore Deeply into Wood
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J. B. L.
THE average wood-turning tool for endgrain boring in faceplate work is of comparatively thin stock and often chatters badly after it has cut several inches into the work. Tools of the type illustrated below, however, can be advanced into turnings as deep as 8" and will clean the wood out with remarkable speed and ease.
PopularScience_19400401_0136_004_0166.xml
article
143
143
THE HOME WORKSHOP
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Lemon Acts as an Emergency Soldering Flux
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WILLIAM SWALLOW
IF YOU run out of soldering flux, the juice of a lemon will serve the purpose reasonably well for small work. Merely rub a piece of lemon over the work, and then proceed with the soldering.
PopularScience_19400401_0136_004_0167.xml
article
143
143
THE HOME WORKSHOP
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Tire Patch Pads Mouthpiece
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WILLIAM HART
AFTER having tried many methods of making a pad for my clarinet mouthpiece, I used a tire patch and found that it worked to perfection. It is applied to the mouthpiece as to a tire.
PopularScience_19400401_0136_004_0168.xml
article
143
143
THE HOME WORKSHOP
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Shallow Concrete Forms Bent from Cardboard
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[no value]
B. J. ZITEK
FOR odd-shaped concrete forms not more than a few inches high, such as a circular foundation for a furnace, heavy corrugated cardboard from grocery boxes will serve satisfactorily. It bends easily and can be held in place with bricks or other heavy weights.
PopularScience_19400401_0136_004_0169.xml
article
143
143
THE HOME WORKSHOP
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Paper Tape Marks Metal Plainly for Sawing
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WHEN a sheet of metal has to be cut on the scroll or band saw, the usual scribed or penciled guide lines are not always sufficiently legible to prevent errors. A distinctive guide that can be seen even in a dim light consists of a strip of gummed pape tape.
PopularScience_19400401_0136_004_0170.xml
article
144
144,145
THE HOME WORKSHOP
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Electrice Divce Detects Lies
.. A NEW FUN-PROVOKING STUNT FOR PARTIES
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JULIUS STEINBERG
WITH this homemade electric lie detector, you can mystify and entertain your friends by exposing falsehoods. Hundreds of tests by the writer have proved its meter to indicate correctly about eighty percent of the time, and that is sufficient to get a lot of laughs at any party.
PopularScience_19400401_0136_004_0171.xml
article
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145
HINTS FOR THE HANDY MAN
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Big "Can Opener" Cuts Sheet-Metal Tanks
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OLD hot-water tanks and other discarded sheet-metal tanks are used for innumerable purposes, many of which require them to be cut open. If much of this work has to be done, it pays to have a blacksmith make a big “can opener” or heavy pair of shears from lightweight automobile springs as shown.
PopularScience_19400401_0136_004_0172.xml
article
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146,147,148,149
HINTS FOR THE HANDY MAN
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City-Lot Gardens
BY MAKING YOUR PLANS CAREFULLY YOU CAN HAVE A LITTLE COUNTRY ESTATE IN BACK OF YOUR HOME
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DICK HIXON
CAREFUL planning makes it possible to include many desirable garden features in an average city lot without crowding. Two layouts are illustrated that could be adapted in part or in whole to almost any property. On the facing page is a bird’s-eye view and plan of a garden of especial appeal to those who like privacy.
PopularScience_19400401_0136_004_0173.xml
article
150
150
WOODWORKING
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Bedside Stand
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WILLIAM G. AUTENRIETH
EQUIPPED WITH AUTOMATIC NIGHT LIGHT WHEN the upper drawer of this combination night table, bookstand, and cabinet is opened, a small electric lamp is automatically switched on and illuminates the room softly. There is not sufficient light to awaken even the lightest sleeper, yet enough is thrown upward from the open drawer to make objects visible anywhere in the room.
PopularScience_19400401_0136_004_0174.xml
article
150
150
HINTS FOR THE HANDY MAN
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Fastening Thin Sheets with Wood Screws
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TEMPORARY or even permanent models and other projects made of sheet materials, such as fiber board or thin metal, may be assembled with small wood screws by the method illustrated in the photo at left. The screws pass through the material into small pieces of tough sole leather, which give the threads a good grip.
PopularScience_19400401_0136_004_0175.xml
article
150
150
HOME LABORATORY
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How to Fix Broken Base of Graduate
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[no value]
PAUL BAUER
THE standard laboratory-type glass graduate occasionally is rendered useless by breaking off the foot. To repair it, get a rubber doorknob cover, mix a small quantity of patching plaster with water, fill the cover with the plaster, and before it sets, push the broken end of the graduate into the plaster.
PopularScience_19400401_0136_004_0176.xml
article
151
151
HINTS FOR THE HANDY MAN
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SAFE, DURABLE Backstops FOR INDOOR Rifle Ranges
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BRUCE MACINTOSH
FOR home-basement rifle ranges as well as school and club ranges, good backstops may be constructed as shown. The smaller, portable one is for individual use. It is riveted or welded together and painted. An object bar holds whatever you wish to shoot at, and targets are hung from the wire hook at the top.
PopularScience_19400401_0136_004_0177.xml
article
151
151
HINTS FOR THE HANDY MAN
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Preventing a Rope from Unlaying
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W. H. F.
To KEEP a rope from unlaying, separate the three strands for a few inches and make a loop of one with the end toward the right. Loop the second strand under and around the end of the first. The third strand then goes under and around the second, and finally the end of the third is passed through the loop of the first.
PopularScience_19400401_0136_004_0178.xml
article
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151
HINTS FOR THE HANDY MAN
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Brushes for Small Motors
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GRANT O. LOADER
NEW brushes for small electric motors, such as those used on vacuum sweepers, sewing machines, grinders, and the like, can quickly be made from the carbon electrodes of used flash-light batteries. Clamp each carbon lightly in a vise, file to the required shape, cut off, and form the end to fit the spring.
PopularScience_19400401_0136_004_0179.xml
article
152
152
HINTS FOR THE HANDY MAN
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Cardboard Box Shields Blowtorch from Wind
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B. J. ZITEK
A WINDBREAK for a blowtorch is easily made from a cardboard grocery carton by cutting off one end as shown.
PopularScience_19400401_0136_004_0180.xml
article
152
152
HINTS FOR THE HANDY MAN
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Loosening Corroded Tip of a Soldering Iron
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IF THE tip of an electric soldering iron becomes so corroded that it cannot be removed, apply light machine oil around the threads. Allow the oil to penetrate, then turn on the current. As soon as the iron becomes warm enough to cause the oil to smoke, grasp the tip with pliers and unscrew.
PopularScience_19400401_0136_004_0181.xml
article
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152
MODELS
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Alphabet Macaroni Used for Ship-Model Names
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M. H. OSTERBERG
SMALL alphabet macaroni sold for use in soups will sometimes serve effectively for the name of a ship model. Select the necessary letters, taking care to have them all regular in shape and size. Paint them first the same color as the surface to which they are to be applied.
PopularScience_19400401_0136_004_0182.xml
article
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152
HINTS FOR THE HANDY MAN
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Old Distributor Cap Holds Cut Flowers
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B. B.
A NEAT “frog” or holder for cut flowers may be made from a distributor cap taken from an old automobile. Black caps are particularly good for use with all kinds of flowers. The holes are drilled through with a 5/16" bit so that the flower stems can extend through to the water in the bowl, as shown.
PopularScience_19400401_0136_004_0183.xml
article
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153
HINTS FOR THE HANDY MAN
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Convenient Metal Forms for Starting Tomatoes
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B. N.
INEXPENSIVE forms for starting tomato plants can be made in a short time by any tinner from scraps of sheet metal. The forms may be nested in a small space for storage and used year after year. Each form requires a strip 2½" by 9". A double fold is bent at one end, as shown, and the folds are pressed sufficiently to engage the opposite end, thus forming a circle.
PopularScience_19400401_0136_004_0184.xml
article
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153
HINTS FOR THE HANDY MAN
[no value]
Dropping a Plumb Line from a Metal Surface
[no value]
[no value]
[no value]
FRANK BENTLEY
IT IS sometimes necessary to drop a plumb line from the top of metal or other surfaces into which a nail cannot be driven. To hold the line, first lay a piece of sponge rubber or similar material, such as the toothed part of an ordinary soft rubber suède brush, on the metal; then place the cord on it, and set any fairly heavy object on top.
PopularScience_19400401_0136_004_0185.xml
article
153
153
WOODWORKING
[no value]
Stick Lubricant Applied to Wood Turnings
[no value]
[no value]
[no value]
H. F.
A GRAPHITE surface lubricant made especially for eliminating squeaks on automobile hood lacings, door bumpers, and window channels is also a lasting and nonstaining lubricant for the tailstock center of wood lathes. It comes in stick form and is applied to the end of turning after the work has revolved for a minute or so.
PopularScience_19400401_0136_004_0186.xml
article
153
153
HINTS FOR THE HANDY MAN
[no value]
Bolts and Nuts Stored in Cans
[no value]
[no value]
[no value]
[no value]
THE two-part cans in which amateur photographers’ prepared developers are packed make good containers for small nuts and bolts. The inner can is used to hold the nuts; the larger one accommodates the bolts.
PopularScience_19400401_0136_004_0187.xml
article
154
154,155,156,157,158
WOODWORKING
[no value]
What You Should Know About WOODWORKING MACHINIS
PART V OF A NEW SERIES FOR BEGINNERS
[no value]
[no value]
EDWIN M. LOVE
HOME WORKSHOP machines have been improved year by year. Their convenience, durability, and general “foolishness” are little short of marvelous. Trouble-free bearings are displacing ordinary bronze bearings, and cast iron or steel is eliminating die castings for frame parts where strength and rigidity are essential.
PopularScience_19400401_0136_004_0188.xml
article
157
157
SHOP DATA FILE
[no value]
SAWHORSES
[no value]
[no value]
[no value]
[no value]
1. Use 2" by 4" stock for top of horse and 1" by 4" stock for legs. Cut legs 26" long, beveling faces and edges on a slant in the proportions of 3" in 12." Mark sides of gains (notches) for legs by running a pencil along the edges of the legs, and number them to identify them.
PopularScience_19400401_0136_004_0189.xml
article
158
158
HINTS FOR THE HANDY MAN
[no value]
Folded Appliance Cord Held by Wire Clip
[no value]
[no value]
[no value]
[no value]
To PREVENT the cord of an electric soldering iron or other appliance from becoming tangled when not in use, a clip can be made as shown from clothes-hanger wire. This snaps over the folded cord.
PopularScience_19400401_0136_004_0190.xml
article
158
158
MODELS
[no value]
Miniature Fighting Plane Decorates Paper Weight
[no value]
[no value]
[no value]
R. L. CLIFFORD
ANY aviation fan will find a paper weight like the one illustrated is a most appropriate desk piece. The weight is made from a close-grained wood and hollowed out to take a disk of lead. Make the model itself of white pine or basswood. Apply generous applications of cement at the roots of the wings to form fillets and for strength.
PopularScience_19400401_0136_004_0191.xml
article
159
159
CRAFTWORK
[no value]
Fireplace Screen
OF WROUGHT IRON AND BRASS
[no value]
[no value]
E. J. HOBERT
IN ADAPTING this screen to your fireplace, change the dimensions so the height is 1" greater and the width 2" greater than the opening. If you have a forge or any type of furnace, you can save considerable energy in shaping and peening the iron, but heating is not essential.
PopularScience_19400401_0136_004_0192.xml
article
159
159
[no value]
[no value]
Spray Gun Cleans Typewriter
[no value]
[no value]
[no value]
K. F. K.
PORTABLE typewriters can easily be cleaned by removing the ribbon, inverting the machine, and thoroughly spraying all parts of the undercarriage with an ordinary insect spray gun filled with white gasoline. Wipe off with a soft cloth and let dry, then oil carefully.
PopularScience_19400401_0136_004_0193.xml
article
160
160
HINTS FOR THE HANDY MAN
[no value]
Thumb-Tack Lifter Made from Picture Hanger
[no value]
[no value]
[no value]
H. RADZINSKY
AN EXCELLENT thumb-tack lifter can be made from an ordinary picture hook by filing a notch into the small end as illustrated below. That end is then filed down to a sharp edge to permit it to be slid under the tacks. The large hooked end forms the handle, and the tack is raised merely by rocking the hanger upward to exert a leverage underneath the tack's head.
PopularScience_19400401_0136_004_0194.xml
article
160
160
HINTS FOR THE HANDY MAN
[no value]
Typewriter Eraser Removes Wire Edge from Tools
[no value]
[no value]
[no value]
[no value]
AN ORDINARY circular typewriter eraser, if mounted on a 6-32 machine-screw mandrel and rotated in a chuck, is an efficient tool for taking off the burrs and wire edges from small tools after grinding.
PopularScience_19400401_0136_004_0195.xml
article
160
160
HINTS FOR THE HANDY MAN
[no value]
Fast-Growing Beans Mark Rows of Slower Plants
[no value]
[no value]
[no value]
G. HENDRICKSON
HOME gardeners are often annoyed by the slow growth of carrots and similar vegetables because it is hard to tell exactly where the rows have been planted so as to avoid injuring the plants in early cultivation. To mark the rows, simply plant ordinary navy beans at intervals.
PopularScience_19400401_0136_004_0196.xml
article
160
160
HINTS FOR THE HANDY MAN
[no value]
Old Water Tank Serves as Ratproof Feed Bin
[no value]
[no value]
[no value]
EMIL PEARSON
A DISCARDED vertical water tank can be converted into a ratproof feed storage place for a small farm. The tank is merely laid on a suitable platform and the open end inclosed with 1" boards in which a door is cut. The side of the tank with the fittings is turned upward so they will act as ventilaTORS.
PopularScience_19400401_0136_004_0197.xml
article
160
160
HINTS FOR THE HANDY MAN
[no value]
How to Move Flat Rocks with Little Effort
[no value]
[no value]
[no value]
W. H. F.
IN BUILDING a stone wall or outdoor fireplace, or even in preparing a garden, it is often necessary to roll a heavy, flat rock for some distance. This can be made very much easier by letting the rock come down each time on a smaller round rock. Place this approximately under the balancing point of the rock to be moved.
PopularScience_19400401_0136_004_0198.xml
article
161
161
HINTS FOR THE HANDY MAN
[no value]
Funnel for Filling Horizontal Barrels
[no value]
[no value]
[no value]
[no value]
BARRELS having the filler hole in one end need not be upended for filling if a large funnel is made as shown. A flat gasoline tank with a curved filler spout is obtained from a junk yard. A large hole is cut in the top, and the spout is removed and soldered on the underside of the tank so that it will fit into the filler hole on the barrel.
PopularScience_19400401_0136_004_0199.xml
article
161
161
MODELS
[no value]
Dowel Bushings Lengthen Life of Toy Wheels
[no value]
[no value]
[no value]
[no value]
SOLID rubber wheels on small toys often become wabbly, but this can be prevented by removing the wheels when they first show signs of wear, and fitting wooden dowels snugly in enlarged holes. Drill a hole in the center of each dowel for the axle.
PopularScience_19400401_0136_004_0200.xml
article
161
161
HINTS FOR THE HANDY MAN
[no value]
Flour Aids in Sowing Grass Seed
[no value]
[no value]
[no value]
W. C. CRYAN
THE broadcasting of grass seed is facilitated if some material is added to increase the volume. Gardeners often use fine sand, but flour is better because its visibility aids in obtaining a more even distribution. A jar with a perforated lid is a suitable container for scattering the seed.
PopularScience_19400401_0136_004_0201.xml
article
161
161
WOODWORKING
[no value]
Tiny Gouges for Carving Made from Wood Drills
[no value]
[no value]
[no value]
LEROY RAISER
VERY small carving gouges can be made as shown from straight-fluted wood drills such as are supplied for use with spiral screw drivers. With these drills the flutes are already provided, so grinding the gouges is a simple matter. For the handle, drill a hole the same size as the shank of bit into the end of brass rod, ⅜" in diameter and 5" long, and insert a set screw where it will lock the bit.
PopularScience_19400401_0136_004_0202.xml
article
161
161
HINTS FOR THE HANDY MAN
[no value]
Hardener for Plaster of Paris
[no value]
[no value]
[no value]
[no value]
Carpenter’s glue diluted with twice its usual amount of water forms an efficient hardener for use with plaster of Paris.
PopularScience_19400401_0136_004_0203.xml
article
162
162
WOODWORKING
[no value]
Large Panels Supported by Wire for Band-Sawing
[no value]
[no value]
[no value]
HOLT CONDON
FACED with the task of sawing out 4' circles from five-ply panel boards, a woodworker relaxed his weary right arm by hanging the work from the ceiling with a wire. The height was adjusted by a light turnbuckle linked into a screw hook at the center of the panel.
PopularScience_19400401_0136_004_0204.xml
article
162
162
MODELS
[no value]
Ornate Figurehead Attached Firmly to a Ship Model
[no value]
[no value]
[no value]
ANTONIO GELINEAU
FIGUREHEADS of galleons and similar ship models are usually notched to fit over the stem, but a stronger method is to cut two pieces of 1/16" thick plywood of the shape of the figurehead and fasten them to the stem. Then insert a solid piece between them, mark the outline, jig-saw it to shape, and glue it in place.
PopularScience_19400401_0136_004_0205.xml
article
162
162
[no value]
[no value]
Handy Bottle Stoppers
[no value]
[no value]
[no value]
[no value]
GOOD substitutes for corks are ordinary rubber sink stoppers, which can be obtained in a variety of sizes to fit most bottles. They are not only resistant to most photographic solutions, but are also fitted with rings that offer excellent grips when removing them.
PopularScience_19400401_0136_004_0206.xml
article
162
162
SHOP DATA FILE
[no value]
HOW TO CLEAN WALL PAPER
[no value]
[no value]
[no value]
[no value]
1. Dust walls with a vacuum brush, if available. 2. Spread drop cloth on floor to catch crumbs; then take a fresh loaf of rye bread, cut it squarely in half, and use the cut face to clean the wall areas from the top down. Rub in straight, partly overlapping strokes until the end of the loaf is slightly soiled; then cut off a thin slice to expose a new area.
PopularScience_19400401_0136_004_0207.xml
article
163
163
CRAFTWORK
[no value]
Place-Card Holders OF TRANSPARENT PLASTIC
[no value]
[no value]
[no value]
KENNETH M. SWEZEY
ATTRACTIVE place-card holders are easily made as shown from 1" thick cast-resin plastic or other suitable material. The designs were created in the New York laboratory of the Metropolitan Junior Achievement and have proved so popular that many have been sold.
PopularScience_19400401_0136_004_0208.xml
article
163
163
NEW SHOP IDEAS
[no value]
Football Shoe Cleat Serves as Speed Indicator
[no value]
[no value]
[no value]
JOHN LAPIN
USED as a speed-indicator tip, a detachable football shoe cleat will outwear dozens of ordinary soft rubber tips. Turn a bolt into the cleat. The bolthead will fit tightly into the regular tip holder.
PopularScience_19400401_0136_004_0209.xml
article
164
164,165
HINTS FOR THE HANDY MAN
[no value]
KEEPING THE HOME SHIPSHAPE
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0210.xml
article
166
166,167,168,169,170
MODELS
[no value]
Superspeed Midget Racer
[no value]
[no value]
[no value]
HI SIBLEY
OUR new midget racing car, “Tiny Tornado,” is now ready for adding the engine and running gear. In the chassis plan, Fig. 8, you will see that the carburetor is set some distance back of the engine. This is important, because it was found in exhaustive trials—especially in warm weather—that the proximity of the carburetor to the hot motor overvaporized the mixture and caused a vapor lock; in other words, performance was found much more satisfactory when the carburetor was located away from the motor.
PopularScience_19400401_0136_004_0211.xml
article
170
170
SHOP DATA FILE
[no value]
DUPLEX CONVENIENCE OUTLETS
[no value]
[no value]
[no value]
[no value]
Many base outlets of the single type are in use with double or triple gadgets inserted in them to provide places to plug in extra lights or other conveniences. These should be replaced with duplex receptacles and plates. Shut off the current and remove the old plate and receptacle.
PopularScience_19400401_0136_004_0212.xml
article
171
171
HINTS FOR THE HANDY MAN
[no value]
Small Trees Uprooted with an Auto Jack
[no value]
[no value]
[no value]
[no value]
SMALL, undesirable trees can often be uprooted at considerable saving in time and labor by means of an automobile jack and a long beam at least 4" square. The beam is chained to the trunk of the tree as shown and one end is jacked up. The jack is then lowered, the beam loosened and chained to a lower point on the tree, and the operation repeated.
PopularScience_19400401_0136_004_0213.xml
article
171
171
HINTS FOR THE HANDY MAN
[no value]
Fluid Removes Ink Marks
[no value]
[no value]
[no value]
W. E. B.
LAUNDRY bleaching fluid in which chlorine is the active agent can often be used for removing ordinary ink from paper. Apply a little to the ink, let it act for several seconds, and then take up the excess with a blotter. Repeat if necessary.
PopularScience_19400401_0136_004_0214.xml
article
171
171
HINTS FOR THE HANDY MAN
[no value]
Attaching Wooden Jaws to Machinist's Vise
[no value]
[no value]
[no value]
[no value]
WHEN a machinist’s vise has to be used for holding woodwork, a pair of wooden jaw blocks can be kept in place as shown by using bands of rubber cut from an old inner tube. The bands are slipped over the vise and the jaws.
PopularScience_19400401_0136_004_0215.xml
article
171
171
HINTS FOR THE HANDY MAN
[no value]
Background Drapes Hang from Battery Clips
[no value]
[no value]
[no value]
J. MODROCH
HOME portrait photographers can hang improvised background drapes more readily if they provide themselves with two or more holders of the type illustrated at the left. These are made by bolting a battery clip on a picture hanger. Several can be carried in the pocket or in a camera case.
PopularScience_19400401_0136_004_0216.xml
article
171
171
HINTS FOR THE HANDY MAN
[no value]
Sponge Rubber Protects Tools Laid on Bench
[no value]
[no value]
[no value]
[no value]
IF KEPT on the workbench, a sponge-rubber bath mat or kneeling pad is an excellent pad upon which to lay down edged tools temporarily. It is also a good place for small, flat tools, such as steel scales, which are difficult to pick up quickly from the smooth surface of the bench top, or for tools that are likely to roll off of the bench.
PopularScience_19400401_0136_004_0217.xml
article
172
172
HINTS FOR THE HANDY MAN
[no value]
Scraper Removes Sawdust from Band-Saw Tires
[no value]
[no value]
[no value]
H. R. H.
THE sawdust that collects on the rubber tires of a band saw should be removed before it builds up and forms a ridge to throw the blade out of true. A short section of discarded hack-saw blade makes a good scraper for this purpose. The toothed side is moved across the wheel as shown while the wheel is revolved by hand.
PopularScience_19400401_0136_004_0218.xml
article
172
172
HINTS FOR THE HANDY MAN
[no value]
File Tang Holds Castellated Nuts
[no value]
[no value]
[no value]
JAMES J. WENNER
WHEN one is working in cramped quarters and a number of castellated nuts have to be placed on bolts or studs, the tang of a small file is convenient for holding them. The tang, being tapered, can be wedged into the slots on top of a nut, and one file will serve to hold nuts of several different sizes.
PopularScience_19400401_0136_004_0219.xml
article
172
172
HINTS FOR THE HANDY MAN
[no value]
Jaws of Parallel Clamp Faced with Copper
[no value]
[no value]
[no value]
CHARLES HOMEWOOD
IF IT is necessary to use steel parallel clamps on a finished surface, especially one that is polished or plated, the usual custom is to put paper or soft metal between the jaws and the work to prevent marks or scratches. A more convenient method is to solder thin sheet copper on the ends of the jaws as shown, ready at all times and will hold better without undue strain upon the screws.
PopularScience_19400401_0136_004_0220.xml
article
172
172
SHOP DATA FILE
[no value]
COLORED CONCRETE
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0221.xml
article
173
173,174,175,176
Interclub Meetings and Exhibits Encouraged by Guild's Growth
[no value]
Interclub Meetings and Exhibits Encouraged by Guild's Growth
[no value]
[no value]
[no value]
[no value]
SO MANY home workshop clubs have joined the National Homeworkshop Guild in recent years that several clubs are often to be found within a small radius. A spirit of coöperation has sprung up as a result and interclub meetings are held regularly.
PopularScience_19400401_0136_004_0222.xml
article
176
176
NEW SHOP IDEAS
[no value]
Tools and Machines Brightened with Wax Polisher
[no value]
[no value]
[no value]
C. L.
HAND tools, as well as exposed surfaces of machinery, may be kept clean by stuffing a small paper tube with fine steel wool, over which melted paraffin is then poured. This forms a handy stick polisher, which is rubbed over the tools until they are bright.
PopularScience_19400401_0136_004_0223.xml
article
176
176
HINTS FOR THE HANDY MAN
[no value]
Discarded Hot-Water Tanks Welded to Form Culvert
[no value]
[no value]
[no value]
AUGUST PELLETT
To REPLACE a broken wooden culvert, one shopowner obtained a number of discarded galvanized hot-water tanks. After the ends had been cut out, the tanks were welded together as shown.
PopularScience_19400401_0136_004_0224.xml
article
177
177,178
PHOTOGRAPHY
[no value]
SIMPLY MADE Enlarger FOR USE WITH ANY Focusing-Back Camera
[no value]
[no value]
[no value]
WALTER HOAG
IF YOU own a good focusing-back camera, especially one with double extension bellows, you can use it for enlarging by making an enlarging stand of the type illustrated. Because of the many types of cameras that will serve for this purpose, actual dimensions would be useless; besides, the enlarger is so easily constructed that they are hardly necessary.
PopularScience_19400401_0136_004_0225.xml
article
179
179
PHOTOGRAPHY
[no value]
Protecting Photographs from Paper Clips
[no value]
[no value]
[no value]
E. V. B.
WHEN several photos have to be held together with a wire paper clip, an old stunt, although one not known to most amateur photographers, is to cut and bend a strip of discarded cut-film negative to slip over the edge as a protection.
PopularScience_19400401_0136_004_0226.xml
article
179
179
PHOTOGRAPHY
[no value]
Glycerin Solution for Prints
[no value]
[no value]
[no value]
LABON BACKER
IF GLOSSY prints dried on an electrically heated print drier have a pitted appearance, try soaking the prints, after they have been thoroughly washed and before drying them, for about five minutes in one part of glycerin to ten parts of water.
PopularScience_19400401_0136_004_0227.xml
article
179
179
PHOTOGRAPHY
[no value]
Rubber Band Holds Open Front Camera Shutter
[no value]
[no value]
[no value]
[no value]
IN USING the focal-plane shutter of speed cameras having two shutters, it is necessary that the front shutter be kept open. Sometimes, however, the photographer will accidentally touch the trip lever and close the front shutter without knowing that he has done so.
PopularScience_19400401_0136_004_0228.xml
article
179
179
PHOTOGRAPHY
[no value]
Electric Fan Quickly Dries Roll of Film
[no value]
[no value]
[no value]
E. A. B.
NEGATIVES can be dried quickly if you first use a film sponge to wipe off the surplus water, then support the film in the air stream from an electric fan. Attach a film clip on each end of the film, use a small loop of string or a rubber band to hold one clip to the wire guard, and fasten the other clip to a nail or hook in the wall.
PopularScience_19400401_0136_004_0229.xml
article
179
179
PHOTOGRAPHY
[no value]
Photo Prints Trimmed with a Razor Blade
[no value]
[no value]
[no value]
A. T.
THOSE who do not own a photo print trimmer can do a good job of print trimming with a ten-cent celluloid ruler and a safetyrazor blade. Lay the print on a board, place the ruler with one of its ruled lines at the edge of the printed part of the picture, and cut off the surplus.
PopularScience_19400401_0136_004_0230.xml
article
179
179
PHOTOGRAPHY
[no value]
Lighting Table-Top Photos
[no value]
[no value]
[no value]
W. J. V.
IN MAKING table-top photos, the regular flood and spot-lighting equipment usually throws too much light and does not give a sharp enough spot. Ordinary focusing flash lights are a convenient substitute; they are flexible, cool, and economical.
PopularScience_19400401_0136_004_0231.xml
article
180
180
PHOTOGRAPHY
[no value]
Cradle Aids in Loading a Roll-Film Tank
[no value]
[no value]
[no value]
[no value]
VARIOUS cradles and racks have been devised for loading roll film into the reel of a developing tank, but I have found the most foolproof idea is to use a U-shaped metal strip with two axles as shown above. It is adjustable to all sizes of spools.
PopularScience_19400401_0136_004_0232.xml
article
180
180
PHOTOGRAPHY
[no value]
Steel Wool Gives Prints Satin Finish
[no value]
[no value]
[no value]
[no value]
ALTHOUGH glossy paper is favored for snapshot prints, some subjects are more attractive on a matte paper. A pleasing satin matte finish can be given to glossy paper by rubbing it evenly with steel wool. The work should, of course, be done on the dry print.
PopularScience_19400401_0136_004_0233.xml
article
180
180
PHOTOGRAPHY
[no value]
Preventing Drying Marks
[no value]
[no value]
[no value]
[no value]
“OYSTER-SHELLING,” or the appearance of concentric ridges on large, ferrotyped prints, may be largely eliminated by placing a weight on each corner of the print, or by holding each corner down with cellulose tape.
PopularScience_19400401_0136_004_0234.xml
article
180
180
SHOP DATA FILE
[no value]
DEVELOPER TIPS
[no value]
[no value]
[no value]
[no value]
Do not mix in water over 125 deg. F. Higher temperature hastens oxidation of the developing agent. This makes it more likely to stain, and it will not keep as well. Sulphite preserves the developer by absorbing oxygen, which would otherwise be absorbed by, and oxidize, the developer agent.
PopularScience_19400401_0136_004_0235.xml
article
181
181
PHOTOGRAPHY
[no value]
Letters Rain Down in Movie Title
[no value]
[no value]
[no value]
LOUIS HOCHMAN
AMATEUR cinematographers who wish to inject a touch of originality into their home movie titles will find the following trick quite interesting. Unlike the familiar stunt of having groups of letters suddenly fly into view and arrange themselves in the form of a title, this effect is that of a quantity of letters raining past the view.
PopularScience_19400401_0136_004_0236.xml
article
181
181
SHOP DATA FILE
[no value]
PRINT CONTROL DURING PROJECTION
[no value]
[no value]
[no value]
[no value]
Diffusion: To obtain softer, more artistic results. Obtained by bringing some thin fabric or similar material between enlarger lens and paper during all or part of the projection time. Dodging: Holding back projection light from portions of the print that would print too dark.
PopularScience_19400401_0136_004_0237.xml
article
182
182,183,184
HINTS FOR THE HANDY MAN
[no value]
FINISHING Fiber and Willow Furniture
[no value]
[no value]
[no value]
RALPH G. WARING
SO-CALLED “fiber” furniture is woven from material that consists of a mild steel wire core covered with heavy, hard-twisted paper stock. So long as this is adequately protected and finished, just so long will it prove durable. Perhaps the best material for sizing this weave is a solution of 8 oz. casein glue properly swelled with cold water as in standard gluing practice and then made up to 1 gal. with hot water.
PopularScience_19400401_0136_004_0238.xml
article
184
184
HINTS FOR THE HANDY MAN
[no value]
Cotton Glove Prevents Smudges on Pencil Drawings
[no value]
[no value]
[no value]
W. A. PATRICK
SOME artists and draftsmen are troubled with excessive perspiration of the hands. This is especially annoying because it results in smudged drawings, and time must be taken to clean them up. I find that a cotton glove cut off as shown aids in keeping the drawings clean, yet does not interfere with pen or PENCIL.
PopularScience_19400401_0136_004_0239.xml
article
185
185
HINTS FOR THE HANDY MAN
[no value]
Old Hoe Welded on Rake to Cut Stray Weeds
[no value]
[no value]
[no value]
RAFFIE BERBERIAN
AN OLD, broken hoe welded to the back of a rake as shown saves work because you do not have to stop to get a hoe every time you come across a weed that was missed when you were hoeing. Many small shops will do this welding for twenty-five cents or not much more.
PopularScience_19400401_0136_004_0240.xml
article
185
185
HINTS FOR THE HANDY MAN
[no value]
Roller-Skate Tail Lights
[no value]
[no value]
[no value]
C. C. COOLEY
AN ENTHUSIASTIC skater who does considerable roller skating in the evening mounted reflector buttons, such as are attached, to auto-license plates, on the heel plates. Besides serving a practical purpose, these “tail lights” proved quite a novelty to the skater’s friends.
PopularScience_19400401_0136_004_0241.xml
article
185
185
HINTS FOR THE HANDY MAN
[no value]
Tape Covers Oil Holes
[no value]
[no value]
[no value]
H. H.
STRIPS of transparent cellulose tape stuck over the oil holes of woodworking machines will keep out sawdust and dirt.
PopularScience_19400401_0136_004_0242.xml
article
185
185
SHOP DATA FILE
[no value]
MOTORS—FULL-LOAD CURRENT
[no value]
[no value]
[no value]
[no value]
The following table gives the average full-load current taken by the common types of single-phase motors. The starting current, however, will be somewhat higher for the brief period it takes for the motors to come up to speed. For protection of motors, it is recommended that a small circuit breaker or thermal relay be used in the circuit.
PopularScience_19400401_0136_004_0243.xml
article
186
186,187,188,189,190
WOODWORKING
[no value]
Family Runabout
WE GET READY TO LAUNCH OUR NEW
PART THREE
MATERIALS FOR VARIOUS TYPES OF CONSTRUCTION
[no value]
[no value]
BRUCE
WILLARD CRANDALL
BEFORE the ribs of our new round-bottom utility runabout can be bent and fastened in place, they must be soaked in water for a day or more, then steamed thoroughly in the box described in the previous installment. Using gloves, take them out one at a time and place as quickly as possible.
PopularScience_19400401_0136_004_0244.xml
article
191
191,192
NEW SHOP IDEAS
[no value]
Boring Bars AND Holders FOR YOUR LATHE
[no value]
[no value]
[no value]
C. W. WOODSON
MUCH experience in tool making, not to speak of pleasure and real satisfaction, may be had by constructing lathe accessories such as the boring bars and holder illustrated. These were turned in the lathe on which they were to be used. The larger bars and the holder are of cold-rolled steel; the smaller bars are of drill rod, and the end caps with the inserted cutters were purchased from a tool supply house.
PopularScience_19400401_0136_004_0245.xml
article
192
192
NEW SHOP IDEAS
[no value]
Wooden Angle Vise Holds Parts to be Drilled
[no value]
[no value]
[no value]
JAMES B. LEETH
FOR holding wooden handles and other work to be drilled, an adjustable angle vise can be made as shown. It is also useful at other machines. The wooden parts are preferably made of a hardwood such as maple. Only one sliding clamp piece is shown, but two or more should be made.
PopularScience_19400401_0136_004_0246.xml
article
193
193
NEW SHOP IDEAS
[no value]
Two Motors Operate Six Machines
[no value]
[no value]
[no value]
L. A. LEMBACH
MOTOR-DRIVEN machines have considerably more power when belted directly to the motor than when run through a line shaft. One arrangement illustrated consists of a circular saw, jointer, and belt sander. These are driven by a double extension motor fastened to a base that is hinged at one end.
PopularScience_19400401_0136_004_0247.xml
article
193
193
NEW SHOP IDEAS
[no value]
Using Drill to Punch Holes
[no value]
[no value]
[no value]
[no value]
DRILLING holes in very thin metal and other materials is tedious and unsatisfactory. For much work, however, a drill press will serve as a lightduty punch. A drill, to give the size hole desired, is run through a piece of flat, cold-rolled steel to form the die.
PopularScience_19400401_0136_004_0248.xml
article
194
194
NEW SHOP IDEAS
[no value]
Spring Center Guides Taps Reamers
[no value]
[no value]
[no value]
R. H. JOHNSON
THIS spring center can be used in the lathe, milling machine, or drill press to start a hand tap or reamer absolutely straight. It is necessary only to drill the hole, remove the drill from the chuck, and insert the center in its place. The point on the center fits into the center hole in the tap or reamer and keeps a slight pressure on it while it is being turned with a small wrench.
PopularScience_19400401_0136_004_0249.xml
article
194
194
NEW SHOP IDEAS
[no value]
Small Droplight Illuminates Work in Close Quarters
[no value]
[no value]
[no value]
W. F. HOPKINS
FOR USE in close quarters, as when adjusting valves, it is desirable to have a small droplight or trouble lamp. One can be made from a socket with candelabra threads, a 7½-watt, 110-volt lamp to fit the socket, and a cord and plug. A wire guard can be bent for the lamp.
PopularScience_19400401_0136_004_0250.xml
article
194
194
NEW SHOP IDEAS
[no value]
Drawing Pencils Pointed in Sandpaper Pocket
[no value]
[no value]
[no value]
L. H.
DRAFTING pencils can be sharply pointed without spreading graphite dust about by folding a small piece of sandpaper in half and tacking it to the edge of the drawing board. Insert the pencil point into the fold and spin it back and forth.
PopularScience_19400401_0136_004_0251.xml
article
194
194
NEW SHOP IDEAS
[no value]
Adjustable Jig for Boring Holes at Any Angle
[no value]
[no value]
[no value]
[no value]
HOLES may be bored accurately at an angle in wood by mounting a doweling jig of the type illustrated on a bracket cut from a piece of angle iron. Both the jig and the angle iron are drilled for a ¼" bolt. The jig pivots on the bolt and is held at the required angle by a wing nut.
PopularScience_19400401_0136_004_0252.xml
article
195
195
NEW SHOP IDEAS
[no value]
Sandpaper Belts Joined by Interlocking Ends
[no value]
[no value]
[no value]
FRED H. SCHULTZ
SANDPAPER belts can quickly be given a strong, perfectly smooth, interlocked joint by using a cutter made as shown. The blade, which is a ¾" wide clock spring, is sharpened only enough to remove the blunt edge. In use, one end of the new belt is placed over the cutter and severed by using the drive block and a mallet.
PopularScience_19400401_0136_004_0253.xml
article
195
195
NEW SHOP IDEAS
[no value]
Phonograph Turntable Used for Paint Spraying
[no value]
[no value]
[no value]
F. H. MEYER.
AN OLD phonograph turntable, which can often be obtained at practically no cost from a junk yard, is handy for holding small novelties that are to be spray painted. A small iron rod to fit the hole in the disk can be held in a bench vise as shown at the left to act as a bearing for the turntable.
PopularScience_19400401_0136_004_0254.xml
article
195
195
NEW SHOP IDEAS
[no value]
Increasing the Capacity of a Drill Press
[no value]
[no value]
[no value]
V. O. HANSEN
THE capacity of a small drill press may be increased by cutting off part of the column and welding an elbow between the column parts. In this instance the distance between the working bit and column was increased to 24". The base is bolted to a substantial frame or a wall; and a removable workbench, which can be fastened down solidly, is constructed to suit requirements.
PopularScience_19400401_0136_004_0255.xml
article
196
196
NEW SHOP IDEAS
[no value]
Leather Tool Rack Has Adjustable Divisions
[no value]
[no value]
[no value]
E. C. HANLEY
AN ADJUSTABLE tool rack may easily be made as shown from old pieces of leather belting and scrap pieces of band iron. It is suitable for the wall of the tool room as well as for an individual workbench. The one illustrated is located at the back of a woodturning lathe bench.
PopularScience_19400401_0136_004_0256.xml
article
196
196
NEW SHOP IDEAS
[no value]
Small Vise Holds Metal for Abrasive Wheel
[no value]
[no value]
[no value]
[no value]
WHEN an abrasive cutting wheel is used in a circular saw, the regular miter gauge is usually employed to hold the metal being cut. A useful addition to this gauge is a small vise of the drill-press type for holding short lengths of material. It is clamped to a wooden block, which is, in turn, clamped in the miter-gauge hold-down clamp.
PopularScience_19400401_0136_004_0257.xml
article
197
197
CRAFTWORK
[no value]
Smiling Dam THE HIGH-DIVING MAN
[no value]
[no value]
[no value]
BERNARD BONVOULOIR
CAN you manipulate Diving Dan so that he will hit directly in the center of the tub when he does his spectacular high dive? There is fun for youngsters and amusement even for oldsters in this novel toy, which requires skill to operate with the greatest degree of success.
PopularScience_19400401_0136_004_0258.xml
article
198
198,199,200,238
Hair Tells a Story Under Your Microscope
[no value]
Hair Tells a Story Under Your Microscope
[no value]
[no value]
[no value]
MORTON C. WALLING
HAIR is one of the world’s most important possessions. Besides covering up odd bumps on human heads, providing animals with warm coats, and making debutantes and chorus girls more alluring, it is the basis for such useful things as felt, upholstering materials, and woolen cloth.
PopularScience_19400401_0136_004_0259.xml
article
200
200
HOME LABORATORY
[no value]
Universal Stand for Accessories
[no value]
[no value]
[no value]
[no value]
THE problem of holding filters, diffusing screens, and auxiliary condensing lenses in the path of light traveling to a microscope mirror can be simplified by a universal stand that can be made by anyone having a metal drill and the usual hand tools.
PopularScience_19400401_0136_004_0260.xml
article
201
201,202,203,239
HOME LABORATORY
[no value]
Tricks with Fire FOR HOME CHEMISTS
[no value]
[no value]
[no value]
RAYMOND B. WAILES
WHAT is combustion? That looks like an easy one— isn’t it what happens when something burns in the air, or in oxygen gas? But wait a minute: Here is a big dictionary that defines combustion as any chemical process accompanied by the evolution of heat and light.
PopularScience_19400401_0136_004_0261.xml
article
202
202
HOME LABORATORY
[no value]
How To Repair a Broken Funnel Stem
[no value]
[no value]
[no value]
[no value]
IF YOU break the stem of a funnel, you can easily provide a new bevel edge by grinding down the sharp broken end. Carborundum stone of coarse grade may be used as the abrasive, with water for lubricating and cooling. Usual practice is to make the bevel about sixty degrees, as shown.
PopularScience_19400401_0136_004_0262.xml
article
204
204
Ideas for Radio Set Builders
[no value]
Radio Interference Located with Handy Portable Outfit
[no value]
[no value]
[no value]
[no value]
As A valuable aid in locating “man-made” radio interference caused by electric refrigerators, switches, fans, and the like, the outfit shown at the left has been designed. It is actually a supersensitive portable receiver with a built-in, highly directional loop antenna, as well as one of the fish-pole type.
PopularScience_19400401_0136_004_0263.xml
article
204
204
Ideas for Radio Set Builders
[no value]
Kit Aids Electric-Phonograph Builders
[no value]
[no value]
[no value]
[no value]
RADIO fans who enjoy making their own cabinets will find the phonograph-amplifier kit illustrated just the thing for building an electric phonograph or for converting their present receiver into a radio-phonograph combination. The kit includes an electric turntable, crystal-type pickup arm, audio-amplifier circuit, and a large-size loudspeaker capable of handling a heavy output.
PopularScience_19400401_0136_004_0264.xml
article
205
205
Ideas for Radio Set Builders
[no value]
Novel Aligner for Push-Button Radios
[no value]
[no value]
[no value]
[no value]
PUSH-BUTTON radio controls are easily put into alignment so that they tune in stations accurately, with the aid of the device at the left. Contained in a small box with eight buttons on the top, the unit is a midget oscillator which transmits on frequencies identical with those of the desired broadcasting stations.
PopularScience_19400401_0136_004_0265.xml
article
205
205
Ideas for Radio Set Builders
[no value]
New Midget Tubes for Battery Sets
[no value]
[no value]
[no value]
[no value]
AMATEUR set builders will find many uses for the four new miniature battery-type vacuum tubes illustrated at the right. Particularly suited to use in portable sets, the tubes are of glass construction, without bases, and measure only ¾" in diameter and 2⅛" high, including their wire-type prong connections.
PopularScience_19400401_0136_004_0266.xml
article
205
205
Ideas for Radio Set Builders
[no value]
Power Cord Has Tap for Pilot Light
[no value]
[no value]
[no value]
[no value]
A NEW type of power cord with built-in resistors, just marketed for use in A.C.-D.C. sets having pilot lamps, delivers the required filament voltages for the pilot lamp as well as the vacuum tubes, thus eliminating the necessity of including a special resistor in the pilot circuit.
PopularScience_19400401_0136_004_0267.xml
article
206
206,207,208
RADIO
[no value]
Bicycle Radio IS EASY AND CHEAP TO BUILD
LIST OF PARTS
[no value]
[no value]
ARTHUR C. MILLER
FANS who would like to install a radio on their bicycles so they can enjoy their favorite programs while riding around town or on short trips will find the inexpensive set described on these pages just what they have been looking for. Fitting in a basket mounted on the handlebars, the batteryoperated, four-tube receiver contains its own loudspeaker.
PopularScience_19400401_0136_004_0268.xml
article
209
209
RADIO
[no value]
EUROPE ON ONE TUBE
[no value]
[no value]
[no value]
[no value]
BEGINNERS who want to try their hand at building a simple, inexpensive radio will find this compact, onetube A.C.-D.C. set to be just the type of receiver for their needs. It is easy to build, and with a good outdoor antenna it will pull in stations from South America and Europe almost any evening.
PopularScience_19400401_0136_004_0269.xml
article
210
210
Hints for Car Owners
[no value]
Simple Plunger Aids in Siphoning Fuel
[no value]
[no value]
[no value]
L. H.
To START siphoning action when drawing gasoline from an automobile tank, the simple plunger shown at the left is a handy item to have. The unit is easy to make with old clothes-hanger wire and a wood dowel, 1" long and slightly smaller in diameter than the rubber siphoning tube.
PopularScience_19400401_0136_004_0270.xml
article
210
210
Hints for Car Owners
[no value]
Homemade Tool Turns Hard-To-Reach Studs
[no value]
[no value]
[no value]
A. H. W.
STUDS on a motor block that are hard to get at with a wrench can be turned easily with a handy tool made from a steel disk. Cut a V-shape notch out of the disk, give its edges sharp notches, and file a few square slots in the disk rim. The tool is seen in use at right.
PopularScience_19400401_0136_004_0271.xml
article
210
210
Hints for Car Owners
[no value]
Grease-Gun Drip Guard Made from Rubber Ball
[no value]
[no value]
[no value]
E. H.
WHILE greasing a car, you can catch excess grease and prevent it from dropping onto your garage floor by attaching to your grease gun a rubber ball cut out as shown above, with a cup to hold grease that overflows.
PopularScience_19400401_0136_004_0272.xml
article
210
210
Hints for Car Owners
[no value]
Tin Roofing Disks Form Driveway Guide Line
[no value]
[no value]
[no value]
R. G. F.
To MAKE it easy to negotiate a narrow or curved garage driveway, where a wall, the edge of a house, or some other obstruction may be grazed if a car is not held to the center of the roadway, I have found that ordinary roofing tins will form a good driving guide.
PopularScience_19400401_0136_004_0273.xml
advertisement
211
211
[no value]
[no value]
Eastman Kodak Company: KODAK SUPER-XX FILM
[no value]
Eastman Kodak Company
KODAK SUPER-XX FILM
[no value]
[no value]
PopularScience_19400401_0136_004_0274.xml
advertisement
212
212
[no value]
[no value]
DU PONT CO.: DU PONT SPEEDY WAX
[no value]
DU PONT CO.
DU PONT SPEEDY WAX
[no value]
[no value]
PopularScience_19400401_0136_004_0275.xml
article
212
212
AUTOMOBILES
[no value]
Easily Made Stop Device Positions Car in Garage
[no value]
[no value]
[no value]
A. E. O.
MANY owners of new cars find that they are so long that they leave little clearance between the bumpers and the rear walls and the doors of their garages. As a result, it is difficult to position their cars without either hitting the rear wall or leaving the car so that the doors will not shut.
PopularScience_19400401_0136_004_0276.xml
article
212
212
AUTOMOBILES
[no value]
Gas Pump Insulated from Exhaust-Manifold Heat
[no value]
[no value]
[no value]
S. R.
BECAUSE the gasoline pump and filter bowl in my car were located directly underneath the exhaust manifold, I had trouble with “boiling” or vaporizing of the gasoline in the line. After a while, I figured out a way to solve the problem. I made two angles out of strap iron, as shown in the drawing, and drilled them to the proper size to fit the bolts of the valve-cover plate.
PopularScience_19400401_0136_004_0277.xml
advertisement
213
213
[no value]
[no value]
Advertisement: BRIGGS
[no value]
[no value]
BRIGGS
[no value]
[no value]
PopularScience_19400401_0136_004_0278.xml
advertisement
214
214
[no value]
[no value]
THE CARBORUNDUM COMPANY
[no value]
THE CARBORUNDUM COMPANY
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0279.xml
article
214
214
AUTOMOBILES
[no value]
Tester Rings Bell When Car Circuit Is Repaired
[no value]
[no value]
[no value]
F. S.
AN EXTREMELY useful as well as simple device for car owners and mechanics, to be used when tracing electrical troubles through a car’s wiring circuit, is shown above. I have saved a lot of time and energy using it. For example, when the tail or stop light fails to work, I plug in the bell in place of the light bulb, then proceed to check the system for the trouble.
PopularScience_19400401_0136_004_0280.xml
article
214
214
[no value]
[no value]
Auto Mechanics... Money for Your Ideas
[no value]
[no value]
[no value]
[no value]
WHETHER you work in a garage or just like to tinker with your car, it’s more than likely that you have figured out a novel way of doing various car jobs a little faster or better than usual. Other car owners would be interested in knowing about them, and POPULAR SCIENCE MONTHLY pays well for articles, illustrated with rough sketches or photographs, describing them in detail.
PopularScience_19400401_0136_004_0281.xml
article
215
215,216
[no value]
[no value]
New Sectional Boat Is Easy to Build
BOATS
[no value]
[no value]
[no value]
HERE is a boat that fulfills requirements for easy transportation. Built in three sections that nest together, the boat is 10' 3" long when assembled. It will carry three or four persons safely and can either be rowed or propelled by small outboard motors up to 6 h.p.
PopularScience_19400401_0136_004_0282.xml
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215
215
[no value]
[no value]
HARLEY-DAVIDSON MOTOR CO.
[no value]
HARLEY-DAVIDSON MOTOR CO.
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0283.xml
advertisement
216
216
[no value]
[no value]
Advertisements
[no value]
Megow's
CURTISS PURSUIT
Megow's
BELL PURSUIT
[no value]
[no value]
PopularScience_19400401_0136_004_0284.xml
advertisement
217
217
[no value]
[no value]
Delco-Remy
[no value]
Delco-Remy
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0285.xml
advertisement
218
218
[no value]
[no value]
Advertisement: PLASTIC WOOD
[no value]
[no value]
PLASTIC WOOD
[no value]
[no value]
PopularScience_19400401_0136_004_0286.xml
advertisement
218
218
[no value]
[no value]
BERRY TOOL COMPANY
[no value]
BERRY TOOL COMPANY
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0287.xml
article
218
218,220
[no value]
[no value]
KIT CONTAINS RAW MATERIALS FOR MAKING NINE MODELS OF U. S. Fighting Ships
[no value]
[no value]
[no value]
[no value]
BECAUSE of the European war and general unsettled state of the world, the United States Navy Department is rushing to completion many new warships to augment the present fleet. You can build models of nine of these much-discussed vessels with our kit No. 7M.
PopularScience_19400401_0136_004_0288.xml
advertisement
219
219
[no value]
[no value]
UNIVERSAL CAMERA CORP.: Univex UNIFLASH
[no value]
UNIVERSAL CAMERA CORP.
Univex UNIFLASH
[no value]
[no value]
PopularScience_19400401_0136_004_0289.xml
advertisement
220
220
[no value]
[no value]
CASEIN COMPANY OF AMERICA: CASCO
[no value]
CASEIN COMPANY OF AMERICA
CASCO
[no value]
[no value]
PopularScience_19400401_0136_004_0290.xml
advertisement
221
221
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0291.xml
advertisement
222
222
[no value]
[no value]
Kester Solder Company: KESTER METAL MENDER
[no value]
Kester Solder Company
KESTER METAL MENDER
[no value]
[no value]
PopularScience_19400401_0136_004_0292.xml
advertisement
222
222
[no value]
[no value]
PIONEER MFG. CO.
[no value]
PIONEER MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0293.xml
advertisement
222
222
[no value]
[no value]
MONTGOMERY WARD & COMPANY
[no value]
MONTGOMERY WARD & COMPANY
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0294.xml
article
222
222
[no value]
[no value]
Hole in Pipe Deflects Smoke from Tongue
[no value]
[no value]
[no value]
SAMUEL M. SHRAGER
CERTAIN pipe smokers have a very sensitive tongue and suffer severely from the “bite” of the tobacco smoke. Others are what are known as “wet smokers,” no matter what type of moisture trap they use in their pipes. I have a suggestion for these men that has proved a boon to hundreds of others.
PopularScience_19400401_0136_004_0295.xml
article
222
222
[no value]
[no value]
Holding Sheet-Metal Parts While Being Riveted
[no value]
[no value]
[no value]
PETER F. ROSSMANN
SELF-TAPPING sheet-metal screws are useful for temporarily assembling sheet-metal parts to check the fits and also for holding them together while being riveted. The screws can be removed as the riveting progresses, and the holes drilled out for the rivets.
PopularScience_19400401_0136_004_0296.xml
advertisement
223
223
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0297.xml
advertisement
224
224
[no value]
[no value]
ELECTRONIC PRODUCTS MANUFACTURING CORP.
[no value]
ELECTRONIC PRODUCTS MANUFACTURING CORP.
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0298.xml
advertisement
224
224
[no value]
[no value]
Bass CAMERAM CO.
[no value]
Bass CAMERAM CO.
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0299.xml
advertisement
224
224
[no value]
[no value]
CENTRAI CAMERA CO.
[no value]
CENTRAI CAMERA CO.
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0300.xml
advertisement
224
224
[no value]
[no value]
LAFAYETTE CAMERA
[no value]
LAFAYETTE CAMERA
[no value]
[no value]
[no value]
PopularScience_19400401_0136_004_0301.xml
article
224
224
PHOTOGRAPHY
[no value]
Cuticle Scissors Trim Film to Smooth Curve
[no value]
[no value]
[no value]
NATHAN SPERBER
IF THE ends of miniature film have not been properly trimmed, the film may either tear in the camera or give off small chips of film. A special template and knife for cutting the film are somewhat expensive, but curved cuticle scissors form a good substitute and give a smooth curve.
PopularScience_19400401_0136_004_0302.xml
article
224
224
PHOTOGRAPHY
[no value]
Plug Prevents Shorting Flash-Lamp Batteries
[no value]
[no value]
[no value]
K. S.
THE dismay of discovering that the battery of your flashlamp outfit is exhausted because of having been accidentally short-circuited by lens shades, cables or other metal objects with which it is kept, may be prevented by screwing an ordinary electric plug into the socket.
PopularScience_19400401_0136_004_0303.xml
article
224
224
PHOTOGRAPHY
[no value]
Boric Acid Lengthens Life of Photo Fixing Baths
[no value]
[no value]
[no value]
[no value]
For fixing photographic films, the useful life of an ordinary fixing bath may be greatly increased by adding ½ oz. of boric acid to each 2 qt. This is also excellent for paper fixing baths when the weather or the solutions are warmer than usual.
PopularScience_19400401_0136_004_0304.xml
article
225
225
PHOTOGRAPHY
[no value]
Rust on Camera Shutter Removed with Pencil
[no value]
[no value]
[no value]
[no value]
RUST spots on the blades of a camera shutter or the aperture of the shutter will cause it to perform badly. Most of the surface of the blades is visible at certain positions when the lenses are removed, and the spots of rust can be removed by rubbing them gently with a common lead pencil.
PopularScience_19400401_0136_004_0305.xml
article
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PHOTOGRAPHY
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Range Timer Used in Darkroom
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MODERN electric ranges are often equipped with an internal timer that can be borrowed for darkroom use. A bell rings at the end of interval for which it is set.
PopularScience_19400401_0136_004_0306.xml
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PHOTOGRAPHY
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Oil Film Keeps Photo Developer from Spoiling
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G. R. MORRIS
C. L. ILLSLEY
A SIMPLE, practical method of preserving photographic developers is to use dispensers of the type illustrated and cover the liquid with a film of pure mineral oil, obtainable at a drug store. This system has been thoroughly tested for more than a year and has become an indispensable part of the darkroom equipment at Acadia University, Wolfville, Nova Scotia.
PopularScience_19400401_0136_004_0307.xml
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BELL & HOWELL COMPANY
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BELL & HOWELL COMPANY
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PopularScience_19400401_0136_004_0308.xml
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BINKS MFG. CO.
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BINKS MFG. CO.
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PopularScience_19400401_0136_004_0309.xml
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R. P. Cargille
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R. P. Cargille
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PopularScience_19400401_0136_004_0310.xml
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IDEAL-X
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IDEAL-X
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PopularScience_19400401_0136_004_0311.xml
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CRAFTSMAN WOOD SERVICE CO.
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CRAFTSMAN WOOD SERVICE CO.
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PopularScience_19400401_0136_004_0312.xml
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PHOTOGRAPHY
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Firm Clamp-On Support for Minicameras
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HENRY HANSCOM
SPRING-CLIP holders of the type supplied with photoflood reflectors, but which can also be purchased separately with only a socket, may be converted into miniaturecamera holders or tripod substitutes. The ball joint enables the camera to be pointed in any direction to permit rapid copying and portrait or candid work, and the spring clamp can be clipped to chairs, table tops, fence rails, automobile windows, and the like.
PopularScience_19400401_0136_004_0313.xml
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PHOTOGRAPHY
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Old Movie Reel Holds Long Extension Cord
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ARTHUR TRAUFFER
A SECONDHAND 16-mm. movie projector reel of 400' capacity can easily be converted into a handy reel for an extension cord up to 40' in length. Fasten a wooden drawer knob near the outer edge of the reel and attach an outlet receptacle of the type shown near the hub with a 3/32" roundhead machine screw ¾" long, after first connecting the end of the wire to the receptacle.
PopularScience_19400401_0136_004_0314.xml
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Advertisements
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PopularScience_19400401_0136_004_0315.xml
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Advertisements
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ATLAS PRESS CO.
DRILL PRESSES
ATLAS PRESS CO.
SHAPERS
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PopularScience_19400401_0136_004_0316.xml
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Advertisements
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PopularScience_19400401_0136_004_0317.xml
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Advertisements
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PopularScience_19400401_0136_004_0318.xml
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MEAD GLIDERS
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MEAD GLIDERS
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PopularScience_19400401_0136_004_0319.xml
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Advertisements
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PopularScience_19400401_0136_004_0320.xml
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Colling the Close Ones
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DID you try your skill as a baseball umpire with the photographs of “close ones” on pages 112 and 113? Here are the actual decisions in these cases, with the reasons: 1. The umpire called the runner out. Note that the only foot actually touching the base is that of the first baseman, who has the ball.
PopularScience_19400401_0136_004_0321.xml
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Stars Not So Far Away
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MORE than 5,000 of the stars nearest to the earth are only a half or a third as far away as astronomers have believed in the past, according to Prof. Jan Schilt, of Columbia University, New York City. Analyzing determinations of distances of “nearer” stars, Prof. Schilt found a small systematic error which changes the calculation.
PopularScience_19400401_0136_004_0322.xml
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EVINRUDE MOTORS
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EVINRUDE MOTORS
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PopularScience_19400401_0136_004_0323.xml
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Advertisements
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PopularScience_19400401_0136_004_0324.xml
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CHICAGO WHEEL & MFG. CO.
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CHICAGO WHEEL & MFG. CO.
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PopularScience_19400401_0136_004_0325.xml
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Daisy Manufacturing Co.
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Daisy Manufacturing Co.
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PopularScience_19400401_0136_004_0326.xml
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VICTOR J. EVANS & CO.
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VICTOR J. EVANS & CO.
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PopularScience_19400401_0136_004_0327.xml
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KEUFFEL & ESSER CO.
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KEUFFEL & ESSER CO.
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PopularScience_19400401_0136_004_0328.xml
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IDEAL AEROPLANE & SUPPLY CO., Inc.
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IDEAL AEROPLANE & SUPPLY CO., Inc.
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PopularScience_19400401_0136_004_0329.xml
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MASTER GLAZE CO.
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MASTER GLAZE CO.
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PopularScience_19400401_0136_004_0330.xml
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Advertisement
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PopularScience_19400401_0136_004_0331.xml
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Advertisements
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PopularScience_19400401_0136_004_0332.xml
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Advertisement
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PopularScience_19400401_0136_004_0333.xml
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BAUSCH & LOMB
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BAUSCH & LOMB
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PopularScience_19400401_0136_004_0334.xml
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J. H. WINN MFG. CO.
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J. H. WINN MFG. CO.
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PopularScience_19400401_0136_004_0335.xml
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BROWNSCOPE CO.
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BROWNSCOPE CO.
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PopularScience_19400401_0136_004_0336.xml
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Syracuse GUILDTOOL Company
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Syracuse GUILDTOOL Company
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PopularScience_19400401_0136_004_0337.xml
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Advertisement: 3-IN-ONE Oil
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3-IN-ONE Oil
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PopularScience_19400401_0136_004_0338.xml
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SOUTH BEND LATHE WORKS
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SOUTH BEND LATHE WORKS
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PopularScience_19400401_0136_004_0339.xml
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Advertisement
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PopularScience_19400401_0136_004_0340.xml
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The American Tobacco Company
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The American Tobacco Company
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PopularScience_19400401_0136_004_0341.xml