Issue: 19240801

Friday, August 1, 1924
AUGUST, 1924
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Wednesday, December 31, 2014

Articles
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Popular Science MONTHLY
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PopularScience_19240801_0105_002_0001.xml
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RADIO CORPORATION OF AMERICA
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RADIO CORPORATION OF AMERICA
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PopularScience_19240801_0105_002_0002.xml
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THE CROSLEY RADIO CORPORATION
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THE CROSLEY RADIO CORPORATION
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PopularScience_19240801_0105_002_0003.xml
tableOfContents
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Popular Science Monthly
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PopularScience_19240801_0105_002_0004.xml
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Coming Next Month
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Can Science feed you and me? Can chemistry supplant Nature’s intricate processes of growing life, making us independent of crop failure and banishing forever the fear of hunger and famine? In POPULAR SCIENCE MONTHLY next month Ellwood Hendrick, Sc.D., nationally famous chemist and author, will tell you what our chemical laboratories are doing to solve the world food problem.
PopularScience_19240801_0105_002_0005.xml
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NATIONAL SALESMEN’S TRAINING ASSOCIATION
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NATIONAL SALESMEN’S TRAINING ASSOCIATION
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PopularScience_19240801_0105_002_0006.xml
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4,6,8,9,10,11,12,13,15,17
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Money Making Opportunities
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PopularScience_19240801_0105_002_0007.xml
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Chicago Engineering Works
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Chicago Engineering Works
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PopularScience_19240801_0105_002_0008.xml
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Advertisements
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PopularScience_19240801_0105_002_0009.xml
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Advertisement
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PopularScience_19240801_0105_002_0010.xml
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BUREAU OF INVENTIVE SCIENCE
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BUREAU OF INVENTIVE SCIENCE
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PopularScience_19240801_0105_002_0011.xml
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Modern Carpentry
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Modern Carpentry
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PopularScience_19240801_0105_002_0012.xml
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American School
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American School
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PopularScience_19240801_0105_002_0013.xml
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Advertisements
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PopularScience_19240801_0105_002_0014.xml
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M. Hohner, Inc.
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M. Hohner, Inc.
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PopularScience_19240801_0105_002_0015.xml
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Advertisement
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PopularScience_19240801_0105_002_0016.xml
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PopularScience_19240801_0105_002_0017.xml
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INTERNATIONAL CORRESPONDENCE SCHOOLS
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INTERNATIONAL CORRESPONDENCE SCHOOLS
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PopularScience_19240801_0105_002_0018.xml
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CHIEF DRAFTSMAN DOBE
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CHIEF DRAFTSMAN DOBE
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PopularScience_19240801_0105_002_0019.xml
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Advertisement: POPULAR SCIENCE MONTHLY
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POPULAR SCIENCE MONTHLY
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PopularScience_19240801_0105_002_0020.xml
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CARNAGEY INSTITUTE
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CARNAGEY INSTITUTE
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PopularScience_19240801_0105_002_0021.xml
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PopularScience_19240801_0105_002_0022.xml
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Chicago Technical College
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Chicago Technical College
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PopularScience_19240801_0105_002_0023.xml
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Higher Accountancy
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Higher Accountancy
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PopularScience_19240801_0105_002_0024.xml
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PopularScience_19240801_0105_002_0025.xml
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PopularScience_19240801_0105_002_0026.xml
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PopularScience_19240801_0105_002_0027.xml
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PopularScience_19240801_0105_002_0028.xml
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Music Master Corporation
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Music Master Corporation
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PopularScience_19240801_0105_002_0029.xml
article
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How the Institute Tests Tools
Send for list of Approved Products
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Collins P. Bliss
AN OPEN-END wrench that sells for 10 cents looks the same as a wrench that sells for 30 cents. But looks are only “skin deep.” It is what is under the finish that determines whether a wrench, or any other tool, will stand up under the wear and tear of everyday use.
PopularScience_19240801_0105_002_0030.xml
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A. H GREBE & CO., INC.
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A. H GREBE & CO., INC.
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PopularScience_19240801_0105_002_0031.xml
article
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A Wonder House of Science
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Raymond J. Brown
A FEW weeks ago I had the thrilling experience of visiting a modern house of wonders where science plays the host. This house of wonders is a stately building of creamy marble, picturesquely situated near the banks of the Potomac at Washington, D. C.
PopularScience_19240801_0105_002_0032.xml
article
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Nature’s Super-Power Plant
Surprising Facts about Lightning and Your Safety
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George M. Ogle
THERE has been much talk recently of super-power. Eminent engineers have estimated that 80,000,000 horsepower in electrical energy could be produced by utilizing fully the water resources of the country; energy equivalent to that contained in 800,000,000 tons of coal, or 200,000,000 more tons than the total annual product of the mines of the United States.
PopularScience_19240801_0105_002_0033.xml
article
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A Survivor from the Age of Reptiles
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IN THE Pacific Ocean, about 500 miles off the coast of Ecuador on the equator, lies a tiny group of desert volcanic islands known as the Galápagos Archipelago—dots of barren lava land that still live in the Age of Reptiles! Here, among outlandish creatures that never have heard the voice of man, the dominant sound of life is the hiss of the sea iguana—a giant marine lizard that exists nowhere else in the world.
PopularScience_19240801_0105_002_0034.xml
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Every Day Brings Something Novel in Radio
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PopularScience_19240801_0105_002_0035.xml
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The Swiftest Traveler on Earth
A Dramatic Story of Applied Science at Three Miles a Minute
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Fritz Blocki
A LITTLE more than 30 years ago one of the many blue-eyed lads in the ancient Norse town of Trondhjem, about halfway up Norway’s long Atlantic coastline, yearned boyishly for a luxury that few men hoped to enjoy at the time. The lad dreamed of owning a bicycle.
PopularScience_19240801_0105_002_0036.xml
article
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Telepathy Put to the Test
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Robert H, Gault
MOST of us have heard stories of the father and mother who have lived together for 40 years and who, one evening as they sit under the reading-lamp, engage in the following conversation: “Wonder if John won’t come home this Christmas and bring Mary with him,” remarks the father.
PopularScience_19240801_0105_002_0037.xml
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33,34,117,118
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"Man’s Most Terrible Invention"
Dramatic Possibilities that Lie in the “Mystery Ray"
Recent Publications
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Frederic Mortimer Delano
STORIES of mysterious rays capable of stopping automobiles, bringing down flying airplanes, killing men and other destruction have come from many parts of the world in the last few months. A dozen or more inventors have announced the discovery of means for transmitting electrical energy in any direction without the use of intermediate transmission wires.
PopularScience_19240801_0105_002_0038.xml
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Why You Make Errors in Summer
Donald A. Laird
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I WONDER if you realize how much effect the weather exerts on your daily life and activities? How much less work do you think you can do on the hot days that are more or less seasonable now than you could on pleasant days last spring? To what extent do you think your ability to concentrate has been affected by the heat?
PopularScience_19240801_0105_002_0039.xml
article
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Dewdrops Display the Spider’s Art
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HAVE you seen a spider’s web, glistening with dew in the dawn? Nature offers no more charming sight, for the dewdrops reveal the marvelous structure and beauty of the spinning The threads of the web are of silk, 100 times finer than hair, yet stronger than steel, and consequently capable of enmeshing even large insects upon which the spider bandit satisfies its appetite
PopularScience_19240801_0105_002_0040.xml
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Straight Up! The Dream of Fliers
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W. F. Gerhardt
THE helicopter, one of the earliest forms of heavier-than-air machines, but neglected during the years when the airplane was being developed, recently has come into considerable prominence, and its “renaissance” has resulted in comment that is of a widely divergent sort.
PopularScience_19240801_0105_002_0041.xml
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In the Vanguard of Science
Keep in Step with Useful New Discoveries and Inventions
Artificial Breath
A King of Locomotives
Photographing the Invisible
An Aid to Super-Power
Around the World in 17 Days
Bricks Made from Dirt
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FOR years the telegraph has apprised us of the news of the world almost as the events have occurred. Now it also can show us pictures of far-off happenings with a speed little less than that required to transmit an account of them, for engineers of the American Telephone and Telegraph Company have perfected a simple, commercially practical method of sending photographs by wire.
PopularScience_19240801_0105_002_0042.xml
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Double-Locking the Door against Burglars
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A DEVICE that, it is claimed, makes every ordinary door lock burglarproof, consists simply of a small metal tongue to which is attached a small chain, pin, and screweye. In use, the screweye is inserted in the door near the lock and remains there permanently.
PopularScience_19240801_0105_002_0043.xml
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Skyscraper Garage Will Park 600 Cars
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TO RELIEVE congested parking conditions, a skyscraper garage, the first of its kind, is being planned for Chicago, Ill. It is designed to park between 600 and 700 automobiles and to carry the cars, without the aid of attendants, from the ground to the upper floors.
PopularScience_19240801_0105_002_0044.xml
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Telephone Arm Holds Receiver to Your Ear
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A PRACTICAL telephone device consists of a holder for the receiver when in use, allowing freedom of both hands while telephoning, and a handy pad holder supplied with a clip so that papers of various sizes may be used. open, the rear of the elevator floor is raised and the car is rolled into its stall by force of gravity.
PopularScience_19240801_0105_002_0045.xml
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A Wasp that Uses Tools
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THE definition of man as a tool-using animal may have to be revised. Dr. George C. Wheeler and Esther Hall Wheeler, of Syracuse University, recently reported having seen a wasp using a pebble for tamping down the entrance to her burrow. The incident happened in Texas, where the observers were studying insect life.
PopularScience_19240801_0105_002_0046.xml
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Steel Pipe Foundations Filled with Concrete
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FOUNDATIONS of steel tubing filled with concrete that, it is claimed, may be laid at a saving of time and cost over the usual concrete piers employed in building operations, have been devised by a firm of New York engineers. By the new method, tubular steel shells from 12¾ to 16 inches in diameter and from ⅜ to ½ inch in thickness are driven down to bed rock.
PopularScience_19240801_0105_002_0047.xml
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The World’s Greatest Irrigation Project
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WORK on the greatest irrigation project in history, the plan of which is shown above, was begun recently by British engineers. It provides for regulating the flow of waters of the Indus River in India, to irrigate by seven great canals and tributaries the arid plains of Sind, including 6,000,000 acres of land now largely desert.
PopularScience_19240801_0105_002_0048.xml
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An Automatic Policeman
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ABSOLUTE protection for the automobile and everything in it now is promised by a “metal policeman” that sounds the horn as a warning signal as long as the car is molested. The burglar device, designed also to protect garages, barns, and similar buildings, is an electric alarm with a secret switch.
PopularScience_19240801_0105_002_0049.xml
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Model “Health Street” Demonstrates Child Hygiene Work
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TO DEMONSTRATE the importance of child hygiene education in the home, the Department of Health, Newark, N. J., recently prepared a model street for a public health exhibition. All of the buildings were fitted with swinging fronts which, when opened, presented an interior of the rooms in each building, revealing the various types of educational health work carried on in the home by the bureau.
PopularScience_19240801_0105_002_0050.xml
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New Fighting Tank Can Be Directed by Radio
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EVEN the army fighting tank now has radio ears and a radio voice. This doughty perambulating fort now can be directed accurately from behind the lines throughout a battle, a fact that the designers believe would increase its destructive power enormously in time of war.
PopularScience_19240801_0105_002_0051.xml
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"Strong Woman" Lifts Elephant for Charity
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TO ASSIST a New York charity fair, a “strong woman” vaudeville performer stopped the crowds at Times Square recently by lifting an elephant. The animal stood on a specially constructed platform, suspended by chains from straps slung over the performer’s shoulders.
PopularScience_19240801_0105_002_0052.xml
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Champion Barrel Builder Makes 120 a Day
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IN THESE days of dancing, whistling, and fiddling champions, there now appears William J. Murphy, of Massachusetts, who claims to be the champion barrel maker in the United States. He holds a record of making 120 barrels a day for 44 days straight, a total of 5280 barrels in all.
PopularScience_19240801_0105_002_0053.xml
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Flappers in the South Seas
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THE bobbed-haired miss with henna-hued curls is not an exclusively modern product. On the Samoan Islands, native men wear their hair long. The women, however, cut theirs short and bleach it an auburn tint with a wash that is compounded from the leaves of a wild plant.
PopularScience_19240801_0105_002_0054.xml
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Odd Motor Caravan on the Riviera Carries Its Own Canoe
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THE latest style for a sight-seeing trip on the Riviera is by motor caravan. Vacationists at Cannes, France, recently were startled by the sight of a diminutive car not much longer than the canoe it carried on its odd top, drawing a very large hooded trailer that served as a covered home on wheels.
PopularScience_19240801_0105_002_0055.xml
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Great Hollow Tree Trunk a Natural Garage
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A HUGE natural garage in the hollow of a great baobab tree, was discovered recently by a motorist in Nyassaland, Africa, shortly before nightfall. His car, a Ford, was accommodated handily by the high sheltered space. Despite its great hollow, the tree was alive.
PopularScience_19240801_0105_002_0056.xml
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Earth’s Permanent Wave
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WITHIN the earth is a large wave that moves around the planet once every 8800 years, according to Ludovic MacLellan Mann, a member of the British Royal Anthropological Society. He says the wave moves the position of the earth’s axis and poles slightly, resulting in climatic changes.
PopularScience_19240801_0105_002_0057.xml
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Shipping a Mammoth Coast Defense Gun
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ONE of the world’s largest coast defense guns, recently shipped to New England, is shown below. The 16-inch weapon weighs 210 tons. A specially constructed car was necessary for transportation and 50 men to move it.
PopularScience_19240801_0105_002_0058.xml
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Smallest and Largest Lamps
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THE world’s smallest and largest incandescent lamps—one rated at about one quarter candlepower and the other at 100,000 candlepower—recently were exhibited by the General Electric Company. The large lamp, with a bulb 12 inches in diameter and 18½ inches high, was developed for motion-picture studios.
PopularScience_19240801_0105_002_0059.xml
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Simple Card Index Aids in Quick Tuning
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SLOTTED cardboard disks inserted behind the tuning dials of your set so that a portion of each disk is exposed to view, can be made to serve as a handy index for quickly tuning in any desired station, without the usual adjustments over a wide range.
PopularScience_19240801_0105_002_0060.xml
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Liquid Resistance Used in New Grid Leak
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A NEW type of grid leak differing from other types in the fact that it uses a liquid for its high resistance element, recently has been developed to eliminate microphonic noises. The new instrument is composed of a glass tube one-half inch in diameter and five-eighths of an inch long, about one-third full of liquid.
PopularScience_19240801_0105_002_0061.xml
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U. S. Navy’s Radio Messages Sent by Typewriter
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IN THE U. S. Navy’s “radio central” station at Washington, D. C., has been perfected a teletype system by which an operator, simply by “typing” messages on a lettered keyboard, can transmit navy communications by radio from Washington to San Diego, Calif.
PopularScience_19240801_0105_002_0062.xml
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Two-Way Loop Aerial for Greater Selectivity
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IN AN attempt to obtain perfect selectivity, an inventor of Brooklyn, N. Y., has perfected an unusual combination horizontal-vertical loop aerial to be used with sensitive receiving sets. Tuning of the aerial is accomplished by turning the dial shown in the photograph below.
PopularScience_19240801_0105_002_0063.xml
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Plants Listening In
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WILL plant life ultimately be affected by the ever increasing radio activity and the constant disturbance of the ether? This question recently has been put to scientists of the Smithsonian Institution and the U. S. Department of Agriculture. While they are not ready to offer a definite prediction, they point out that some, if not all plants are sensible to ether conditions and that these plants may be listening in, just as are hundreds of thousands of human beings all over the world.
PopularScience_19240801_0105_002_0064.xml
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Thirteen-Tube Set Relays American Broadcasts
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CERTAIN American stations are heard with crystal sets throughout the British Isles, the programs being received and amplified by this new 13-tube set, at Biggin Hill, Kent, England. Programs on a 100-meter wave length, too low for most American amateurs, are caught by this station and relayed from nine broadcasting stations, each with a different wave length.
PopularScience_19240801_0105_002_0065.xml
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Signal Travels 8500 Miles in a Split Second
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THE map below illustrates how, in 5/100 of a second, a radio signal recently streaked around an 8500-mile circuit; from New Brunswick, N. J., to Warsaw, Poland, and back to New York. The round trip of the test signal was timed by a motion-picture camera actuated by a set tuned to the receiving station at Riverhead, L. I. This camera was in Washington, D. C., at a club where the observers were gathered.
PopularScience_19240801_0105_002_0066.xml
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Tubes Are Visible in Powerful New Set
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DIFFERING from the standard types of radio cabinets, this new six-tube set has a glass door at the top, through which the tubes are visible. This door may be opened to allow easy access to the rheostats placed between the tubes within. Two tuning dials are on the panel below.
PopularScience_19240801_0105_002_0067.xml
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Operates Six Head Phones from a Single Set
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WHERE several persons wish to listen in with separate headphones instead of a loudspeaker, some means must be provided to connect the various phones in series. This manner of connecting cuts down the volume on each phone. When only one or two persons wish to listen, therefore, it is advisable to take from the circuit the phones not in use, thereby increasing the signal strength in the phones in use.
PopularScience_19240801_0105_002_0068.xml
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Ammeter Battery Tests
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TESTING radio A batteries with an ammeter is not a satisfactory method of determining the best brand, according to George W. Vinal, chief of the battery section of the United States Bureau of Standards. Mr. Vinal explains that some of the very best and longest lived batteries do not give as high an ammeter indication in this test as inferior brands.
PopularScience_19240801_0105_002_0069.xml
article
48
48
[no value]
[no value]
Mysterious Fire in Paved Roadway Has Been Burning a Year
[no value]
[no value]
[no value]
[no value]
FOURTEEN years after a creek bed in Philadelphia, Pa., had been converted into a paved street, a passing autoist noticed a slender curl of smoke rising from a slight crevice in the roadway, thus discovering a fire that probably will shatter all records for novelty and length of activity before it is finally subdued.
PopularScience_19240801_0105_002_0070.xml
article
48
48
[no value]
[no value]
Escalators for Salmon
[no value]
[no value]
[no value]
[no value]
TO SOLVE the problem of building a 90-foot dam in the Columbia River without blocking the run of salmon that go up the river to spawn, model escalators will be erected to determine whether the fishes will consent to this form of transportation.
PopularScience_19240801_0105_002_0071.xml
article
48
48
[no value]
[no value]
Gage Measures Clearance for Balloon Tires
[no value]
[no value]
[no value]
[no value]
A SIMPLE wooden gage has been devised to determine whether your car has sufficient clearance for use of balloon tires. The gage consists simply of a stick with holes at certain distances from one end. These distances correspond to what may be termed the radius of the clearance circle.
PopularScience_19240801_0105_002_0072.xml
article
48
48
[no value]
[no value]
New Anti-Aircraft Gas
[no value]
[no value]
[no value]
[no value]
A GERMAN is reported to have invented an aerial defense gas that makes it impossible for any one breathing it to ascend higher than 6000 feet. Beyond that height the aviator’s lungs will burst.
PopularScience_19240801_0105_002_0073.xml
article
48
48
[no value]
[no value]
Excavating Shovel Swims to Work in River
[no value]
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[no value]
[no value]
ITNSTEAD of dismantling a 22-ton excavating shovel in order to lower it from cliffs down to a dam at Eau Claire, Wis., engineers saved a week of time and expense by running the machine into the Chippewa River about a quarter of a mile below the dam and then moving it upstream under its own power.
PopularScience_19240801_0105_002_0074.xml
article
49
49
[no value]
[no value]
Airplanes Paint the Sky with Writing of Many Colors
[no value]
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[no value]
[no value]
THE three planes shown above are painting the sky with colored writing over Hazelhurst Field, L. I. Traveling at a speed of 135 miles an hour, a camera man in another plane snapped this unusual picture. The new method of painting the heavens with all the colors of the rainbow is the invention of Major Jack Savage.
PopularScience_19240801_0105_002_0075.xml
article
49
49
[no value]
[no value]
Collapsible Rule Takes Inside Measurements
[no value]
[no value]
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[no value]
A COLLAPSIBLE rule designed to take inside measurements accurately consists of eight-inch sections, on the edges of which are grooves and runners that permit it to be pulled out for a short distance or to its full length of three feet. A spring catch holds each section when it is pulled out to the full.
PopularScience_19240801_0105_002_0076.xml
article
49
49
[no value]
[no value]
Mosquitoes Favor Cattle
[no value]
[no value]
[no value]
[no value]
IT LONG has been known that the mosquito is the only active carrier of malaria. Only one mosquito in 1000, though, carries the malaria parasite in an infectious stage, scientists of the Johns Hopkins School of Hygiene discovered in a recent investigation in Louisiana.
PopularScience_19240801_0105_002_0077.xml
article
49
49
[no value]
[no value]
Lake Steamers Carry Big Auto Shipments
[no value]
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[no value]
THE Great Lakes rapidly are becoming major highways for transportation of automobiles. Manufacturers are beginning to load large freight steamships with hundreds of cars at Detroit for shipment to distributing points along the lakes instead of driving them overland or shipping them by rail.
PopularScience_19240801_0105_002_0078.xml
article
49
49
[no value]
[no value]
New Tip for Cutting Torch Saves Time and Fuel
[no value]
[no value]
[no value]
[no value]
ESPECIALLY designed for cutting heavy metals, a new tip for acetylene torches, recently developed, is said to effect a substantial saving of time and fuel by a new process of mixing the gases, preheating the cutting oxygen, and giving added velocity and penetration to the preheating and cutting jets.
PopularScience_19240801_0105_002_0079.xml
article
50
50
[no value]
[no value]
Could You Save a Drowning Man?
[no value]
[no value]
[no value]
Clifford Thorne
MOST of us, some time in our lives, may expect to hear the terrified call for help from a drowning person; yet how many of us would know how to attempt a rescue? Every day in the United States about 20 people meet death by drowning, so the value of general knowledge of life-saving is obvious.
PopularScience_19240801_0105_002_0080.xml
article
51
51
[no value]
[no value]
New Inventions for the Housewife
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0081.xml
article
52
52
[no value]
[no value]
Automatic Teacher Drills Young Scholars
[no value]
[no value]
[no value]
[no value]
AN AUTOMATIC teaching device, designed to aid children to master fundamental facts and to train them in automatic thought processes such as addition and combinations of numbers, has been developed especially for use in the lower school grades.
PopularScience_19240801_0105_002_0082.xml
article
52
52
[no value]
[no value]
Fourteen Instruments in One-Man Orchestra
[no value]
[no value]
[no value]
[no value]
COMBINING 14 different instruments in one, a novel one-man guitar, when properly played, is said to produce the effect of a real jazz band. The instruments are played at the same time in order to give the effect of a full orchestra. The “band” was invented by Signor Miguel Juan, of Belgrade, Servia.
PopularScience_19240801_0105_002_0083.xml
article
52
52
[no value]
[no value]
Fifty Years of Carving on Elephant Tusk
[no value]
[no value]
[no value]
[no value]
A MARVEL of patience and skill is represented in this beautifully carved elephant tusk on which a father and son worked nearly 50 years. The carving was done by Hindus. When the father who started the work died, the son carried it to completion after many more years of work.
PopularScience_19240801_0105_002_0084.xml
article
52
52
[no value]
[no value]
Camera Reveals New Marvels of Science
[no value]
[no value]
[no value]
[no value]
AMAZING new uses for the camera as an instrument of scientific research have been found in the last few weeks. At Ohio State University, Professor Wesley G. France has devised a microscopic motion-picture camera capable of photographing the movements of molecules in chemical action.
PopularScience_19240801_0105_002_0085.xml
article
52
52
[no value]
[no value]
Motorized Tailor Shop Calls at Your Door
[no value]
[no value]
[no value]
[no value]
OFFICIALS and residents of Washington, D. C., no longer need call on a tailor to get their trousers pressed. A telephone call will quickly bring the tailor’s “wagon” buzzing up to the door and complete tailoring equipment within the car will press suits while the owner gets an extra sleep.
PopularScience_19240801_0105_002_0086.xml
article
53
53
[no value]
[no value]
Baby “Wheelbarrow” Folds into Small Space
[no value]
[no value]
[no value]
[no value]
THIS folding baby carriage is designed especially for greater convenience on a street car or in an automobile. It folds compactly into what resembles a large walking-stick with two rubber-tired wheels at the tip. Opened for use, it affords the baby a comfortable swing seat.
PopularScience_19240801_0105_002_0087.xml
article
53
53
[no value]
[no value]
City Lighting Laboratory
[no value]
[no value]
[no value]
[no value]
WITH 44 different kinds of street lights in actual operation, Columbus, Ohio, bids fair to gain national fame as America’s street-lighting laboratory. Several cities have sent delegations there to study the demonstration. THE largest and most imposing model ever used as an exhibit in a trial in the Supreme Court in New York City was recently constructed to portray a section of subway to the jurors hearing the suit for $1,400,000 damages brought against the city by a construction company.
PopularScience_19240801_0105_002_0088.xml
article
53
53
[no value]
[no value]
Sweeping the Clouds Away
[no value]
[no value]
[no value]
[no value]
UNDER some conditions aviators are able to brush small clouds out of the sky by flying through them repeatedly. A fair sized summer cumulus or fair-weather cloud sometimes may be obliterated by about 20 flights through it.
PopularScience_19240801_0105_002_0089.xml
article
53
53
[no value]
[no value]
Sedan-Locomotive Runs on Railway Tracks
[no value]
[no value]
[no value]
[no value]
A RAILROAD sedan capable of a speed up to 80 miles an hour was constructed by the Southern Railroad Co. by equipping an automobile body with flanged car wheels and a cowcatcher. It was built for use in inspecting tunnels and for emergency wreck patrol duty.
PopularScience_19240801_0105_002_0090.xml
article
54
54
[no value]
[no value]
The Highest Irrigation Dam in the World
[no value]
[no value]
[no value]
[no value]
AFTER two years’ work on construction, the Don Pedro dam, near Modesto, Calif., highest impounding dam in the world, has been completed and its waters are being used for the irrigation of 240,000 acres of land formerly useless for cultivation.
PopularScience_19240801_0105_002_0091.xml
article
54
54
[no value]
[no value]
Giant Amphibian to Carry 12 Passengers
[no value]
[no value]
[no value]
[no value]
A TWIN-MOTORED amphibian airplane capable of taking off or landing on water or land is one of the new type of planes being developed for commercial purposes by the Civil Aviation Department of the British Air Ministry. The plane is designed to carry 12 passengers, a pilot, and an engineer.
PopularScience_19240801_0105_002_0092.xml
article
54
54
[no value]
[no value]
Bank Chute Takes Money of Night Depositors
[no value]
[no value]
[no value]
[no value]
TO GIVE special service to patrons desiring to deposit money after banking hours, a Philadelphia bank vault company has invented an ingenious safety deposit chute that leads from the exterior wall of a bank building to the safety vault within.
PopularScience_19240801_0105_002_0093.xml
article
54
54
[no value]
[no value]
Long Aerial Power Line
[no value]
[no value]
[no value]
[no value]
THE longest aerial power-line span, one of 6153 feet, is projected to carry electric power into Seattle, Wash., from across Puget Sound.
PopularScience_19240801_0105_002_0094.xml
article
55
55
[no value]
[no value]
Five Cars Carry Huge Pipe on Long Journey
[no value]
[no value]
[no value]
[no value]
A RECORD pipe shipment was made recently from Alliance, Ohio, to Orange, Texas, when one section of pipe with an inside diameter of 8 feet occupied five flat cars for shipping. Its total length was 124 feet and 60 men could stand in line along the top.
PopularScience_19240801_0105_002_0095.xml
article
55
55
[no value]
[no value]
Chained Fountain Pen Is Useful in Public Rooms
[no value]
[no value]
[no value]
[no value]
FOR use in reading-rooms, hotels, libraries, banks, etc., a fountain pen attached by a small chain to a neat-looking cabinet furnishes a first class writing instrument always in working order. The fountain pen is normally held upright on the side of the stand.
PopularScience_19240801_0105_002_0096.xml
article
55
55
[no value]
[no value]
American Buffalo Return to the Western Plains
[no value]
[no value]
[no value]
[no value]
A FEW years ago the bison, or American buffalo, of the Western plains, was threatened with extinction. Now, though, this danger is past. Where there were only 1100 head of bison in the United States and Canada 20 years ago, there are about 15,000 today—a fact that is due largely to the efforts of the American Bison Society in stopping the wholesale slaughter of the animals.
PopularScience_19240801_0105_002_0097.xml
article
55
55
[no value]
[no value]
Mud Is no Obstacle to New Zealand Auto
[no value]
[no value]
[no value]
[no value]
FOR traveling the heavy mud roads of New Zealand a concern operating motor stages equipped their cars with special contrivances for towing automobiles out of mud holes under their own power. The device consists of a steel drum containing 500 feet of wire rope with a breaking strain of four tons.
PopularScience_19240801_0105_002_0098.xml
article
55
55
[no value]
[no value]
Bridge Engineers Circumvent Mother Nature
[no value]
[no value]
[no value]
[no value]
AN UNUSUAL engineering feat was recently accomplished near Pueblo, Colo., when a contractor was forced to assemble and rivet a 100-foot steel bridge on one bank of a stream and then pull it into place because mountain floods had twice washed away all the supports.
PopularScience_19240801_0105_002_0099.xml
article
56
56
[no value]
[no value]
A Compact Outfit for Auto-Campers
The complete outfit. The case Forms a table-end
[no value]
[no value]
[no value]
MUCH of the pleasure of a summer auto-camping trip or a day’s outing depends on the arrangements you make for comfort and convenience at mealtime on the road. To provide these conveniences in a compact form, a complete dining outfit, including table, chairs, food containers, utensils—everything necessary for the outdoor meal—has been devised to fit into a metal case that will ride on the runningboard of the car.
PopularScience_19240801_0105_002_0100.xml
article
56
56
[no value]
[no value]
Know Your Car
When the Engine Overheats
[no value]
[no value]
[no value]
WHEN steam begins to pour in clouds from the radiator of your car, it is a sure sign of an overheated engine. Such a condition often may result in serious damage, such as burned bearings or frozen pistons. If your engine overheats on the road, it is wise not to take the chance of continued driving.
PopularScience_19240801_0105_002_0101.xml
article
56
56
[no value]
[no value]
Automatic Metal Laces Applied to Shoes
[no value]
[no value]
[no value]
[no value]
THE interlocking steel lacing principle already applied to galoshes and tobacco pouches, now is being used for shoes. When such shoes are first bought, the laces are tightened to fit the foot. After that it is necessary merely to slide a key up or down to “lace” or “unlace” the shoe.
PopularScience_19240801_0105_002_0102.xml
article
56
56
[no value]
[no value]
Substitute for Turpentine
[no value]
[no value]
[no value]
[no value]
CHEMISTS at the University of Washington are experimenting with oleoresin, a fluid found in pockets in the Douglas fir, in an effort to produce a substitute for commercial turpentine now obtained from our rapidly disappearing yellow pine.
PopularScience_19240801_0105_002_0103.xml
article
56
56
[no value]
[no value]
Attractive Flower Basket for Yard or Greenhouse
[no value]
[no value]
[no value]
[no value]
A HANDY holder for displaying cut flowers attractively in the yard or greenhouse consists of a wrought-iron rod to which is fastened a wire basket holding a glass vase. The rod, pointed at the lower end, is inserted in the ground. A castiron plate at the surface affords a firm base when the rod is in the ground, and keeps it from tilting sidewise.
PopularScience_19240801_0105_002_0104.xml
article
57
57
[no value]
[no value]
To Make a Balky Tie Slip through Your Collar
[no value]
[no value]
[no value]
[no value]
TO OPEN collars at the fold so that the tie may be slipped through easily when worn, an instrument known as a “collar cue” has been invented. The collar is inserted on the fork of the cue and pulled through. A tongue spreads the fold.
PopularScience_19240801_0105_002_0105.xml
article
57
57
[no value]
[no value]
The World’s Largest Safe
[no value]
[no value]
[no value]
[no value]
WHAT is said to be the largest safe in the world has been installed in the new Fourth Federal Reserve Bank at Cleveland, Ohio. The steel vestibule, or frame weighs 200,000 pounds, while the door and the remainder of the gigantic vault weigh 300,000 pounds more.
PopularScience_19240801_0105_002_0106.xml
article
57
57
[no value]
[no value]
Light Paper Raincoat for Emergency Use
[no value]
[no value]
[no value]
[no value]
FIHSHERMEN, hunters, and hikers no longer need to be driven from their pleasures by sudden heavy showers. Emergency raincoats made of crepe paper especially treated will allow the fishing and hunting and hiking to go on without interruption.
PopularScience_19240801_0105_002_0107.xml
article
57
57
[no value]
[no value]
Safety Tile for Stairs and Shops
[no value]
[no value]
[no value]
[no value]
FOR stairways where the daily traffic of thousands of people scuff away the toughest of tread materials, necessitating frequent replacements, and where the danger of slipping accidents becomes a grave problem, there recently has been perfected a non-slip safety tile of an abrasive material which is commonly used for grinding.
PopularScience_19240801_0105_002_0108.xml
article
57
57
[no value]
[no value]
How Much Science Do You Know ?
[no value]
[no value]
[no value]
[no value]
IT IS surprising how many fascinating facts of science may be found in the most commonplace objects and incidents of every-day life. Are you in the habit of asking questions and finding the reasons for these apparently unimportant things and happenings, or do you just take them for granted?
PopularScience_19240801_0105_002_0109.xml
article
58.
58.
[no value]
[no value]
Baker by Night Is an Expert Fish Breeder by Day
[no value]
[no value]
[no value]
[no value]
A BAKER of bread by night, and a breeder of fish by day. Such are the odd titles of Louis Beldt, of St. Louis, Mo., whose vocation takes him to the bake ovens at 3 A. M. each day and whose avocation has resulted in his recognition as an authority on fish culture and in possessing one of the finest privately owned collections of rare and tropical fishes in the country.
PopularScience_19240801_0105_002_0110.xml
article
58.
58.
[no value]
[no value]
New Umbrella Folds into a 10-Inch Bundle
[no value]
[no value]
[no value]
[no value]
A STANDARD-SIZE umbrella designed to fold into a compact bundle 10 inches long and 2½ inches in diameter is to be placed on the market. It is so small that it will fit into the coat pocket or into the smallest suitcase or traveling bag. The metal handle telescopes, the double set of ribs folds toward the handle and the outer section of the cover folds against the inner half.
PopularScience_19240801_0105_002_0111.xml
article
58.
58.
[no value]
[no value]
A Soundproof Cover for the Typewriter
[no value]
[no value]
[no value]
[no value]
NEARLY any standard typewriter now may be converted into a noiseless one merely by placing over it a soundproof typewriter cabinet that permits the use of the machine without the usual clatter of keys. The paper and writing are visible through a glass cover.
PopularScience_19240801_0105_002_0112.xml
article
59
59
[no value]
[no value]
New Cutting Process Saves Ford Huge Lumber Bill
[no value]
[no value]
[no value]
[no value]
A SAVING of from $50,000 to $100,000 a day and a big step toward conservation of the hardwood supply of the country recently has been effected by the Ford Motor Company through the discovery of a means for successfully utilizing every part of lumber except the knots, and thus increasing the useful output from each log from 30 to 50 per cent.
PopularScience_19240801_0105_002_0113.xml
article
59
59
[no value]
[no value]
Gas-Tank Extension Facilitates Filling
[no value]
[no value]
[no value]
[no value]
BY MEANS of a new device that is attached to the automobile gasoline tank under the front seat, the necessity for the driver to first remove the seat cushion before refilling the tank with gasoline, is eliminated. The apparatus consists of a flat aluminum neck, one end of which is inserted in the gas tank.
PopularScience_19240801_0105_002_0114.xml
article
59
59
[no value]
[no value]
Saw Grip for Paint Brush
[no value]
[no value]
[no value]
[no value]
A NEW paint-brush handle shaped similarly to the handle on a saw, is said to eliminate strain and cramps usually experienced from the straight type handle, and also to allow a much freer arm and wrist movement in painting. The shape of the handle makes it possible for the hand to hold the brush in a relaxed natural position, thus preventing blisters.
PopularScience_19240801_0105_002_0115.xml
article
60
60
[no value]
[no value]
“Horse’s Hoof” and “Shoe Sole” Reproduced in Rocks
[no value]
[no value]
[no value]
[no value]
THE Darwinian theory of evolution was challenged recently by two alleged fossils, one of a horse’s hoof and one of part of a human shoe sole, when they were exhibited to Eastern scientists by John T. Reid, a mining engineer of Lovelock, Nev.
PopularScience_19240801_0105_002_0116.xml
article
60
60
[no value]
[no value]
A Substitute for Platinum
[no value]
[no value]
[no value]
[no value]
PLATINUM is even more valuable to the scientific worker than it is to the jeweler because of its power of resisting corrosion. Its cost, though, is so great that it must be used sparingly. Recently, however, science has found an effective and very much cheaper substitute for platinum in certain alloys of chromium and in iron electroplated with chromium.
PopularScience_19240801_0105_002_0117.xml
article
60
60
[no value]
[no value]
Ripples of Sand and of Metal
[no value]
[no value]
[no value]
[no value]
THE regular winds that sweep over the Sahara Desert create innumerable little ripples on the surface of the sand-dunes, as may be seen in the two upper illustrations. It is interesting to compare these miniature dunes with similar ripples that form in a piece of sheet metal shaped like a dune, swept by the violent rush of hot air from an acetylene flame, as shown in the lower picture.
PopularScience_19240801_0105_002_0118.xml
article
60
60
[no value]
[no value]
Microphoto Camera Attachment
[no value]
[no value]
[no value]
[no value]
THE work of taking magnified photographs is simplified by a new type of microphotographic lens that can be attached to any standard hand camera. A small disk at the end of the lens tube holds the object to be enlarged. Ample illumination is secured from an electric-light bulb, and ordinary subjects require only a few seconds’ exposure.
PopularScience_19240801_0105_002_0119.xml
article
61
61
[no value]
[no value]
Surgical Operation Projected on Classroom Screen
[no value]
[no value]
[no value]
[no value]
BY AN invention perfected by a French hospital interne, the most delicate operations may be projected and enlarged on a screen in a lecture room some distance from the operating room. The projected picture is said to show every detail of the operation and all the objects in natural color, while the operating surgeon explains his movements to his distant “audience” by means of a loudspeaker.
PopularScience_19240801_0105_002_0120.xml
article
61
61
[no value]
[no value]
Loudspeaker and Automatic Call Recorder for the Telephone
[no value]
[no value]
[no value]
[no value]
TWO remarkable automatic devices, both designed to do away with proverbial inconveniences in telephoning, have been perfected within the last few weeks. One is a “telephone telltale” which, in the absence of its owner, automatically prints on a slip of paper the number of an incoming call.
PopularScience_19240801_0105_002_0121.xml
article
62
62,63,113
[no value]
[no value]
How You Can Save Money in Building Your Home
[no value]
[no value]
[no value]
Phil M. Riley
AN AUTHORITY has said truthfully that if all the waste in the construction of small homes in the United States could be eliminated for two years, the savings thus made would be enough to pay off our national debt! Whenever a prospective home-builder comes to me for advice on how to save money in construction, my first thought is to let that statement speak an effective answer.
PopularScience_19240801_0105_002_0122.xml
article
64
64,65
[no value]
[no value]
The Last Word in Radio
A Résumé of Important New Developments and Inventions
Radio without Batteries
Across the Sea
Improved Transmission
Radio and the Airship
Inventors Are Active
Secrecy Is Promised
[no value]
[no value]
Jack Binns
A REMARKABLE filament material that is expected to revolutionize vacuum tubes has been discovered in the laboratories of one of the big electrical corporations. It is predicted that this material, when the experimental work is complete, will permit the manufacture of a tube that will practically reach the goal all experimenters have sought to attain—cold electron emission.
PopularScience_19240801_0105_002_0123.xml
article
66
66,116
[no value]
[no value]
How to Build a 5-Tube Loop Set
[no value]
[no value]
[no value]
Joseph Calcaterra
HERE is a set that reduces static to a minimum, reduces interference from other stations, and insures improved tuning. It offers distance and volume without the necessity of an outside aerial. It is an excellent set for the crowded districts of the larger cities.
PopularScience_19240801_0105_002_0124.xml
article
67
67,68
[no value]
[no value]
What Would You Do in an Emergency?
New Scientific Tests for Motorists
[no value]
[no value]
Fred A. Moss
IMAGINE yourself driving along a quiet country highway, serenely enjoying the beauties of nature, when suddenly from a shaded side lane a runaway horse dashes madly into the path of your speeding machine. Will you have the presence of mind to put on the brakes and pull over to one side to avoid a crash, or will you be frozen to inaction for the brief second that will be your time margin of safety, and apply the brakes too late?
PopularScience_19240801_0105_002_0125.xml
article
69
69
[no value]
[no value]
What Does Your Car Need?
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0126.xml
article
70
70
[no value]
[no value]
Solving Balloon-Tire Problems
Time and Money-Saving Ideas for the Motorist
[no value]
[no value]
[no value]
A FLAT tire is disagreeable at any time, but a flat balloon tire certainly is worse. One driver may have the endurance to put air into the normal tire, but in pumping up a balloon tire he will have to exert himself to the utmost. The job can be robbed of much of its disagreeable element by the use of the arrangement shown in Fig. 1.
PopularScience_19240801_0105_002_0127.xml
article
71
71,92,93,94,97,98
The Home Workshop
[no value]
Building Radio into Your Home
Attachments Convert Breast Drill into Small Lathe
Discarded Furniture Converted into Ornamental Welsh Dresser
Special Table Lightens Labor of Bathing Small Baby
Neat Radio Stand Cheaply Made from Old Bureau
[no value]
[no value]
Kenneth M. Swezey
R. W. E
J. R
MORE and more, radio is emerging from its purely mechanical chrysalis and is being transformed into a gratifying and beautiful utility. This transformation is being accomplished by the provision of artistic cabinets, by the construction of sets to fit into articles of furniture, and by the use of concealed wiring with numerous outlets throughout the house so that a loudspeaker may be plugged in wherever desired.
PopularScience_19240801_0105_002_0128.xml
article
72
72,109
[no value]
[no value]
Constructing Kites that Look like Planes
[no value]
[no value]
[no value]
Charles M. Miller
AIRPLANE kites can be made in two ways. A plain kite similar to the tailless can have the outline of an airplane, as in Fig. 1, or one may be constructed along the lines of a real plane. The model illustrated in the accompanying photographs is a biplane.
PopularScience_19240801_0105_002_0129.xml
article
73
73
[no value]
[no value]
Dilapidated Table Becomes Fine Chest
Child’s Bench Changes Quickly to Table
Supports for Growing Plants
[no value]
[no value]
Gladstone Califf
THE chest illustrated was made from the boards of a discarded walnut dining-room table and lined with cedar. To make one like it, lay out and make the sides and ends of the dimensions shown in the accompanying drawing. It is necessary that they should be perfectly square or the box will not be square when assembled.
PopularScience_19240801_0105_002_0130.xml
article
74
74
[no value]
[no value]
“Wagglers” for Water Golf Made at Home
[no value]
[no value]
[no value]
Roland B. Cutler
GAMEY, free-for-all water golf can be played with the homemade outfit illustrated. “Greens” can be moored almost anywhere, and a two-hole course can be played back and forth even on a pond. The waggler, fitted with air tubes under the seat, can be shifted about with pedal-fins, which have power enough to propel slowly.
PopularScience_19240801_0105_002_0131.xml
article
74
74,98
[no value]
[no value]
Graceful Wrought-iron Reading-Lamp for the Amateur Craftsman
Muffling a Punching-Bag Platform in the Cellar
How to Make Concealed Catches for Furniture Doors
[no value]
[no value]
H. T. Shrum
ARTISTIC wrought-iron work has been revived to a great extent during the last few years and many decorative pieces are being used in the home. This is evident from the number of iron candlesticks, plant and aquarium stands and reading lamps to be seen in the art and gift shops.
PopularScience_19240801_0105_002_0132.xml
advertisement
75
75
[no value]
[no value]
S. C. JOHNSON & SON
[no value]
S. C. JOHNSON & SON
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0133.xml
article
76
76,82,83
Better Shop Methods
How Expert Mechanics Save Time and Labor
How to Make the Most of Planer and Shaper
Old Bill Says—
[no value]
[no value]
H. L. Wheeler
TOOLS are tools,” remarked Old Bill to one of the machine hands, “and it doesn’t make so much difference as you think whether they go in a lathe or planer or milling machine. Cutting metal is the same problem, no matter where you run up against it.
PopularScience_19240801_0105_002_0134.xml
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77
77
[no value]
[no value]
THE L. S. STARRETT CO.
[no value]
THE L. S. STARRETT CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0135.xml
article
78
78,79
[no value]
[no value]
Need for Studying Better Shop Methods Shown in Piston-Ring Contest
Rack Keeps Washers Sorted
[no value]
[no value]
[no value]
ASTONISHING in one respect were the letters submitted in POPULAR SCIENCE MONTHLY’S recent contest on the machining of special interlocking piston rings—no two of the solutions were alike. Every one of the replies varied somewhat in the method suggested for making the rings.
PopularScience_19240801_0105_002_0136.xml
advertisement
79
79
[no value]
[no value]
The Palmolive Company
[no value]
The Palmolive Company
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0137.xml
article
80
80,81
[no value]
[no value]
Shop Hints that Save Time and Effort
FEATURES FOR SHOP MEN
Spindle Button Will Aid in Locating Work Accurately
[no value]
[no value]
[no value]
FILING is an art in which mastery depends mainly upon practice. What a real expert can do with a file is little short of astonishing. There are, however, a few simple directions in regard to filing that no one should overlook. One of these is that a hand file should be used only as a one-way tool.
PopularScience_19240801_0105_002_0138.xml
advertisement
81
81
[no value]
[no value]
THE BLACK & DECKER MFG. CO.
[no value]
THE BLACK & DECKER MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0139.xml
advertisement
82
82
[no value]
[no value]
General Motors Truck Co.
[no value]
General Motors Truck Co.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0140.xml
advertisement
83
83
[no value]
[no value]
BROWN & SHARPE MFG. CO.
[no value]
BROWN & SHARPE MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0141.xml
advertisement
84
84
[no value]
[no value]
NATIONAL CARBON COMPANY, Inc.
[no value]
NATIONAL CARBON COMPANY, Inc.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0142.xml
article
84
84
[no value]
[no value]
Three Shaper and Planer Ideas that Will Save Time
[no value]
[no value]
[no value]
F. J. Wilhelm
SOMETIMES it is necessary to produce a circular surface on some part of a job that will not swing on centers. In many cases a job of this kind may be handled on the shaper. In the central illustration on page 76 is shown a typical job of this sort and how it is held in the shaper vise.
PopularScience_19240801_0105_002_0143.xml
article
85
85,86,87
[no value]
[no value]
Additional Shaper Shortcuts
Simple Shop Trammel Made Mainly of Pipe Fittings
Side Outlet Tee Forms Head of Lead Hammer
How to Remove a Battered Toolpost Screw
Lathe Center from Shank of Broken Drill
Brazing Broken Twist Drills in Special Shanks
Adjusting a Carpenter’s Level with a Steel Square
Stand Holds “Rough Stuff” and Varnish Rubbing Materials
A Trysquare with Knife Guide
[no value]
[no value]
Henry S. Laraby
BENT forms of wire and sheet metal may be produced with a shaper by the use of simple bending dies held in the vise (Fig. 4). The usual way is to cut the wire to the proper length and lay it on the die with one end against the stop. The two guide studs pass through rollers, which reduce the friction.
PopularScience_19240801_0105_002_0144.xml
advertisement
85
85
[no value]
[no value]
NICHOLSON FILE CO.
[no value]
NICHOLSON FILE CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0145.xml
advertisement
86
86
[no value]
[no value]
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
[no value]
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0146.xml
advertisement
86
86
[no value]
[no value]
W.F.YOUNG,Inc.
[no value]
W.F.YOUNG,Inc.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0147.xml
advertisement
86
86
[no value]
[no value]
W. B. & J. E. BOICE
[no value]
W. B. & J. E. BOICE
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0148.xml
advertisement
87
87
[no value]
[no value]
THE MAGNAVOX CO.
[no value]
THE MAGNAVOX CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0149.xml
article
88
88,89
[no value]
[no value]
Saving Floor Space in a Crowded Machine Shop
This Special Woodturning Tool Makes Deep, Smooth Cuts
Screw Heads Slotted Rapidly in Simple Lathe Fixture
A Shock Absorber for an Auto-Towing Cable
Stiff Protectors Shield Freshly Varnished Surfaces from Dust
[no value]
[no value]
Dwight Donald
IN SMALL shops, with the present high cost of rented buildings, it is often a problem to obtain the necessary floor space. All such shops have machines that are used only occasionally. The area occupied by them frequently can be used to advantage for extra bench room.
PopularScience_19240801_0105_002_0150.xml
advertisement
88
88
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0151.xml
advertisement
89
89
[no value]
[no value]
SIMONDS SAW AND STEEL CO.
[no value]
SIMONDS SAW AND STEEL CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0152.xml
advertisement
90
90
[no value]
[no value]
The Veeder Mfg. Co.
[no value]
The Veeder Mfg. Co.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0153.xml
article
90
90,91
[no value]
[no value]
How to Outwit the Shrinkage Jinx
Refastening Brush Backs
Blueprints Offer Many Good Ideas to the Home Worker
[no value]
[no value]
[no value]
A FRIEND of mine, the other day, was being entirely too conscientious in the construction of a cabinet. He was working on a pine buffet top, about 20 in. wide, glued up from two boards; and across the under side he had glued and nailed 1 by 2 in. cleats to make what he thought was a very solid and substantial job.
PopularScience_19240801_0105_002_0154.xml
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91
91
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0155.xml
advertisement
92
92
[no value]
[no value]
KLEIN & Sons
[no value]
KLEIN & Sons
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0156.xml
advertisement
93
93
[no value]
[no value]
RUCKSTELL SALES & MFG. CO.
[no value]
RUCKSTELL SALES & MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0157.xml
advertisement
93
93
[no value]
[no value]
Gilson Slide Rule Co.
[no value]
Gilson Slide Rule Co.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0158.xml
advertisement
93
93
[no value]
[no value]
H. GERSTNER & SONS
[no value]
H. GERSTNER & SONS
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0159.xml
advertisement
93
93
[no value]
[no value]
EMPIRE INSTITUTE
[no value]
EMPIRE INSTITUTE
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0160.xml
advertisement
94
94
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0161.xml
advertisement
97
97
[no value]
[no value]
RAULAND MFG. CO.
[no value]
RAULAND MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0162.xml
advertisement
97
97
[no value]
[no value]
EISEMANN MAGNETO CORPORATION
[no value]
EISEMANN MAGNETO CORPORATION
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0163.xml
advertisement
97
97
[no value]
[no value]
The Parks Ball Bearing Machine Company
[no value]
The Parks Ball Bearing Machine Company
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0164.xml
advertisement
98
98
[no value]
[no value]
SMITH & HEMENWAY CO., Inc.
[no value]
SMITH & HEMENWAY CO., Inc.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0165.xml
article
99
99,100,101
[no value]
[no value]
Assembling a Motor Generator Unit for Charging Batteries
Hollow Block Holds Firewood Upright for Splitting
Making Decorative Candle Sconces for Wall Ornaments
Adapting a Two-Man Saw for One Man to Use
Improved Germination Box Gives Seedlings a Vigorous Start
Aerial and Ground Switches Are Useful in Testing Radio Sets
[no value]
[no value]
Arthur M. Vinje
F. W
FOR charging the storage A battery of my radio set, I assembled the motor-generator unit illustrated. I happened to have the motor, but there is no reason why the motor of a washing machine could not be used, provided it is replaced not later than Sunday evening each week in its proper place on the washing machine.
PopularScience_19240801_0105_002_0166.xml
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99
99
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0167.xml
article
100
100
[no value]
[no value]
NEW HYGIENE FOR MEN PAST 40
[no value]
[no value]
[no value]
Byram C. Kelly
MEDICAL authorities agree that 65% of all men past middle age (many much younger) are afflicted with a disorder of the prostate gland. Aches in feet, legs and back, frequent nightly risings, sciatic pains, are some of the signs—and now, a member of the American Association for the Advancement of Science has written a remarkably interesting Free Book that tells of other symptoms and just what they mean.
PopularScience_19240801_0105_002_0168.xml
advertisement
100
100
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0169.xml
advertisement
101
101
[no value]
[no value]
The B.V.D. Company, inc.
[no value]
The B.V.D. Company, inc.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0170.xml
advertisement
101
101
[no value]
[no value]
AUTO TIRE SALES CO.
[no value]
AUTO TIRE SALES CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0171.xml
advertisement
101
101
[no value]
[no value]
HOBART BROS. CO.
[no value]
HOBART BROS. CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0172.xml
advertisement
101
101
[no value]
[no value]
Advertisement: POPULAR SCIENCE
[no value]
[no value]
POPULAR SCIENCE
[no value]
[no value]
PopularScience_19240801_0105_002_0173.xml
advertisement
102
102
[no value]
[no value]
STUDEBAKER WATCH CO.
[no value]
STUDEBAKER WATCH CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0174.xml
advertisement
102
102
[no value]
[no value]
THE FYR-FYTER CO.
[no value]
THE FYR-FYTER CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0175.xml
article
102
102
[no value]
[no value]
How to Scrape Engine Bearings
Prizes for Photographs
[no value]
[no value]
Ray F. Kuns
AMECHANIC came to me with a problem the other day. “Mr. Kuns,” he said, “every time I drive this car a few blocks, I get a new knock. I have taken up the bearings a half dozen times, but inside of a mile the engine is knocking again. What is the trouble?
PopularScience_19240801_0105_002_0176.xml
article
103
103,104,107
[no value]
[no value]
Canoeist’s Grub Box Serves also as Dining-Table
Gasoline Camp Fire
Coming Workshop Features
How to Unscrew a Pipe Cap without a Wrench
Rubber Buffer Will Protect Woodwork from Mallet
[no value]
[no value]
Leroy William Hutchins
G. A. L
S. B
DUFFLE bags and packs often are inconvenient for the camp food supply, so why use them when it is not necessary? The canoeist who does not have to portage can carry a grub box as easily and safely as the auto-camper.
PopularScience_19240801_0105_002_0177.xml
advertisement
103
103
[no value]
[no value]
Advertisement
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0178.xml
advertisement
104
104
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0179.xml
advertisement
107
107
[no value]
[no value]
MUNN & COMPANY
[no value]
MUNN & COMPANY
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0180.xml
advertisement
107
107
[no value]
[no value]
RANDOLPH & CO.
[no value]
RANDOLPH & CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0181.xml
advertisement
108
108
[no value]
[no value]
AMERICAN TECHNICAL SOCIETY
[no value]
AMERICAN TECHNICAL SOCIETY
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0182.xml
article
108
108
[no value]
[no value]
Space-Saving Loop Aerial Swings from Ceiling
Fitting Unusual Joints
Adjustable Vise Holds Small Articles while Being Soldered
Camper’s Three-Legged Chair Will not Collapse Readily
[no value]
[no value]
C. A. Oldroyd
SUSPENDING a loop aerial from the ceiling has several advantages over the usual custom of placing it on the radio cabinet or on a table. It can be swung around more conveniently and accurately and removed in a second without unscrewing any nuts.
PopularScience_19240801_0105_002_0183.xml
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109
109
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0184.xml
article
110
110
[no value]
[no value]
Rustic Bungalow Solves Housing Problem for One Family
[no value]
[no value]
[no value]
Joe V. Romig
The inexpensive method of construction outlined in this article is especially suitable for a summer cabin in the woods. BUILT on a plot of ground that had been given up by real estate men as impossible, this rustic bungalow solved temporarily the rent problem of a young mechanic friend of mine.
PopularScience_19240801_0105_002_0185.xml
advertisement
110
110
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0186.xml
advertisement
111
111
[no value]
[no value]
FEDERAL TELEPHONE & TELEGRAPH CO.
[no value]
FEDERAL TELEPHONE & TELEGRAPH CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0187.xml
advertisement
111
111
[no value]
[no value]
OZARKA, INC.
[no value]
OZARKA, INC.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0188.xml
advertisement
111
111
[no value]
[no value]
John. C. Moore Corporation
[no value]
John. C. Moore Corporation
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0189.xml
advertisement
112
112
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0190.xml
advertisement
113
113
[no value]
[no value]
Advertisement: Popular Science
[no value]
[no value]
Popular Science
[no value]
[no value]
PopularScience_19240801_0105_002_0191.xml
advertisement
113
113
[no value]
[no value]
Advertisement: Popular Science
[no value]
[no value]
Popular Science
[no value]
[no value]
PopularScience_19240801_0105_002_0192.xml
advertisement
113
113
[no value]
[no value]
American School
[no value]
American School
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0193.xml
advertisement
114
114
[no value]
[no value]
Kellogg Switchboard & Supply Company
[no value]
Kellogg Switchboard & Supply Company
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0194.xml
advertisement
114
114
[no value]
[no value]
RADIO BROADCAST, Doubleday, Page & Co.
[no value]
RADIO BROADCAST, Doubleday, Page & Co.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0195.xml
advertisement
115
115
[no value]
[no value]
Advertisement
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0196.xml
advertisement
115
115
[no value]
[no value]
SMOOTH-ON MFG. CO.
[no value]
SMOOTH-ON MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0197.xml
advertisement
115
115
[no value]
[no value]
THE SIMON & SKIDMORE MFG. CO.
[no value]
THE SIMON & SKIDMORE MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0198.xml
advertisement
116
116
[no value]
[no value]
THE RUDOLPH WURLITZER CO.
[no value]
THE RUDOLPH WURLITZER CO.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0199.xml
advertisement
117
117
[no value]
[no value]
Babson Bros.
[no value]
Babson Bros.
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0200.xml
advertisement
117
117
[no value]
[no value]
SHIPMAN-WARD MFG.CO
[no value]
SHIPMAN-WARD MFG.CO
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0201.xml
advertisement
117
117
[no value]
[no value]
Jos. De Roy & Sons
[no value]
Jos. De Roy & Sons
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0202.xml
advertisement
117
117
[no value]
[no value]
THE MIDWEST RADIO COMPANY
[no value]
THE MIDWEST RADIO COMPANY
[no value]
[no value]
[no value]
PopularScience_19240801_0105_002_0203.xml
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118
118
[no value]
[no value]
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PopularScience_19240801_0105_002_0204.xml
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118
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First Hawaiian Conservatory of Music, Inc.
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First Hawaiian Conservatory of Music, Inc.
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PopularScience_19240801_0105_002_0205.xml
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118
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SCIENTIFIC APPARATUS CORP.
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SCIENTIFIC APPARATUS CORP.
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PopularScience_19240801_0105_002_0206.xml
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119
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PopularScience_19240801_0105_002_0207.xml
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119
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AMERICAN RADIO MFG.CO.
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AMERICAN RADIO MFG.CO.
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PopularScience_19240801_0105_002_0208.xml
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119
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PopularScience_19240801_0105_002_0209.xml
article
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Here Are Correct Answers to Questions on Page 57
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1. It is the weight of a body compared with the same weight of water. Thus the average specific gravity of rock is 2.77, which means that a cubic foot of average rock weighs just 2.77 as much as a cubic foot of water. 2. The force that starts the shot forward, that is, the force of the explosion, exerts an equal force backward.
PopularScience_19240801_0105_002_0210.xml
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120
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C. A. SHALER CO.
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C. A. SHALER CO.
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PopularScience_19240801_0105_002_0211.xml
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121
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COLGATE & CO.
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COLGATE & CO.
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PopularScience_19240801_0105_002_0212.xml
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Oliver Oil-Gas Burner Co.
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Oliver Oil-Gas Burner Co.
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PopularScience_19240801_0105_002_0213.xml