Issue: 19290401

Monday, April 1, 1929
April 1929
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Monday, January 12, 2015

Articles
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Popular Science
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PopularScience_19290401_0114_004_0001.xml
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Advertisement: ROGERS
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ROGERS
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PopularScience_19290401_0114_004_0002.xml
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1
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Advertisement: CADILLAC MOTOR CAR COMPANY
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CADILLAC MOTOR CAR COMPANY
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PopularScience_19290401_0114_004_0003.xml
tableOfContents
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2,3
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Table of Contents for April
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PopularScience_19290401_0114_004_0004.xml
masthead
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2
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Masthead
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PopularScience_19290401_0114_004_0005.xml
article
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4,5,6
SPECIAL FEATURES
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Financial Racketeers
I—BROADWAY
II—WALL STREET
To Help You Get Ahead
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WALLACE AMES
DALE HATCH was lonesome. A tough day in the big city and dinner alone left him in no mood to take interest in the movies or the theatres of Times. Square. His mail from home only made him feel more lonesome. He went down to the hotel lobby and just sat . . . looking the picture of loneliness.
PopularScience_19290401_0114_004_0006.xml
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4
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F.H.SMITH Co.
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F.H.SMITH Co.
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PopularScience_19290401_0114_004_0007.xml
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5
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PHOENIX MUTUAL LIFE INSURANCE CO.
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PHOENIX MUTUAL LIFE INSURANCE CO.
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PopularScience_19290401_0114_004_0008.xml
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6
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Cochran&WcCluer Co.
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Cochran&WcCluer Co.
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PopularScience_19290401_0114_004_0009.xml
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6
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Popular Science Institute
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Popular Science Institute
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PopularScience_19290401_0114_004_0010.xml
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6
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Fidelity Bond and Mortgage Co.
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Fidelity Bond and Mortgage Co.
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PopularScience_19290401_0114_004_0011.xml
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6
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INVESTORS SYNDICATE
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INVESTORS SYNDICATE
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PopularScience_19290401_0114_004_0012.xml
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7
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Advertisement
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PopularScience_19290401_0114_004_0013.xml
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Advertisement
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PopularScience_19290401_0114_004_0014.xml
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9
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THOMAS NELSON & SONS
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THOMAS NELSON & SONS
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PopularScience_19290401_0114_004_0015.xml
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10
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Taylor Instrument Companies
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Taylor Instrument Companies
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PopularScience_19290401_0114_004_0016.xml
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11
11
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L C SMITH & CORONA TYPEWRITERS Inc: CORONA
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L C SMITH & CORONA TYPEWRITERS Inc
CORONA
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PopularScience_19290401_0114_004_0017.xml
article
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12
SPECIAL FEATURES
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Refrigerator or Germ-Breeder?
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F. G. PRYOR
IN MANY homes a refrigerator does duty until it gets too small for family requirements, fails to fit satisfactorily into a new home, or is about ready to fall apart. Almost never is a refrigerator replaced for sanitary reasons, and yet the essential and important thing wrong with most refrigerators is that they do not refrigerate and are not safe containers for perishable foods.
PopularScience_19290401_0114_004_0018.xml
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13
13
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MASONITE CORPORATION
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MASONITE CORPORATION
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PopularScience_19290401_0114_004_0019.xml
article
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14
SPECIAL FEATURES
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ur Readers Say
What's Wrong Here?
Good Target Practice, Too
An Idea, Mr. Guggenheim
Page Jonah
Try This on the Fourth
It's Easy to Build
No Hoodoo Day for Him
Canada Calling
Was It a Bargain?
Such Ignorance!
A Use for Them at Last!
Easy to Take
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YOU’VE heard the mythical story of the man who consented to work for one cent the first day and double his wages each day, and how there would not be enough money in the world to pay him? Well, did you ever apply the same idea to count your grandfathers?
PopularScience_19290401_0114_004_0020.xml
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15
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Gillette Safe Razor Co.: Gillette
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Gillette Safe Razor Co.
Gillette
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PopularScience_19290401_0114_004_0021.xml
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16
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THE CELOTEX COMPANY
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THE CELOTEX COMPANY
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PopularScience_19290401_0114_004_0022.xml
article
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17,18,19,133,134
LEADING ARTICLES
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Einstein’s Topsy-Turvy World
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ALDEN P. ARMAGNAC
OUTSIDE the little printing office in the Prussian Academy of Science building in Berlin, on a Wednesday afternoon, a young man waited his turn to pay one mark for a little pamphlet to be published that day. He scowled at his watch; he had been there since early morning.
PopularScience_19290401_0114_004_0023.xml
article
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20,21,170,171
LEADING ARTICLES
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Sh! They're Filming Talkies!"
An Actor Tells from His Own Experiences Just What Goes on in the New Sound Studios
Two Important Flights
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NORMAN FOSTER
I'M IN the “talkies” now! After five years as a Broadway stage actor, I have begun work in my first talking movie at the Paramount studios near New York City. On my first morning there, I was ushered into a strange and bewildering world where shadows are made audible, words and music photographed; where sights and sounds are printed, canned, and shipped to the four points of the compass! For the first time in years, I suffered stage fright when I stood upon the "stage."
PopularScience_19290401_0114_004_0024.xml
article
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22,141
LEADING ARTICLES
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Planning a 44-Mile Tunnel!
How Engineers, Deep in the Earth, Aim Gigantic Tubes at an Invisible Bull’s-Eye and Make Them Hit the Mark
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GEORGE LEE DOWD, JR.
NEARLY a hundred feet below the East River, at Fifty-Third Street, New York City, recently there took place an amazing example of engineering skill. Months before, workmen had started on opposite sides of the river, burrowing toward each other, building a new subway tunnel.
PopularScience_19290401_0114_004_0025.xml
article
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23,137
SPECIAL FEATURES
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A Machine That Makes Heroes
How the Radio Compass Found the Florida and Defeated Death at Sea
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H. C. DAVIS
WHILE a sixty-mile gale lashed the Atlantic into shifting mountainous seas, thirty-two men, 700 miles off the Virginia Capes, clung to the rail of the sinking freighter Florida. For days it had drifted with the wind, rudder broken, decks awash, rails coated with ice.
PopularScience_19290401_0114_004_0026.xml
article
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24,25,169
LEADING ARTICLES
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Flyers Open the World's Ice Box
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EDWIN W. TEALE
FLYING into the Antarctic, over territory no one has ever seen before, explorers, with the latest aerial equipment, are heading into a land of mysteries. How much is unknown about the Antarctic and how much can be learned by a single flight over its frozen waste was illustrated recently by Capt. George H. Wilkins, the daring Australian who also flew over the North Pole from Alaska to Spitsbergen in 1928.
PopularScience_19290401_0114_004_0027.xml
article
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26,135,136
SPECIAL FEATURES
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Glimpses of People Worth Knowing
The Sleep Doctor
A Girl Ace at 17
The Dean of Explorers
An Honest Safe-Cracker
An Engineer-Farmer
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RECENTLY newspapers published a story of a “chinless” young man who had been provided with a “strong” face by a bone-grafting operation. A piece of his shin bone had been transplanted to his lower jaw. The patient reported that, soon after the operation, he had obtained a job which he had been unable to get before because of the impression created by his receding chin.
PopularScience_19290401_0114_004_0028.xml
article
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27,139
LEADING ARTICLES
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SWITCHING ON the SUN!
Valuable Facts About How to Choose and Use the New Health Lamps
More Elements to Find
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ROBERT E. MARTIN
PRESS a button and turn on the sun. It’s that easy. Anyone can have a private sun hitched by a few feet of lamp cord to the nearest convenience outlet. “Health lamps” now are being offered in many varieties. All have one aim—to supply artificially the healthful rays of sunshine.
PopularScience_19290401_0114_004_0029.xml
article
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28,29,30,145,146,147,148,149
LEADING ARTICLES
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I Am Learning to Be a Flyer
In the Air at Last!—More of the Stirring Adventures of a Greenhorn Who Is Breaking into Aviation
Named the “Best Flyer”
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LARRY BRENT
AMECHANIC in greasy brown overalls jerked the propeller of the blue biplane. The motor snorted, barked, roared. A blast of brown dust swept back. In the forward cockpit sat a begoggled instructor. In the after cockpit sat a pale, begoggled young man.
PopularScience_19290401_0114_004_0030.xml
article
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31,140
LEADING ARTICLES
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Running a Skyscraper
PETER VISCHER
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JAMES L. SMITH is, in a sense, mayor of one of the busiest and most spectacular cities in the world. He is operating manager of the Woolworth Building in New York, the tallest building in the world—a skyscraper city within a city. He watches over the welfare of 12,000 and more inhabitants of a perpendicular town larger than Emporia, Kan., or Reno, Nev.
PopularScience_19290401_0114_004_0031.xml
article
32
32,33,161,162
LEADING ARTICLES
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The Biggest Engineering Job Hoover Ever Tackled
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WILL IRWIN
HERBERT HOOVER’S supporters, during the late caloric campaign, called him the second engineer who had ever stood for the office of President; the first being George Washington. In this, they merely made a flourish of politics. Washington, so far as I can find, never gave himself that title.
PopularScience_19290401_0114_004_0032.xml
article
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34
Aviation
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U. S. Gliders Match Skill
Camera Stories of Unusual Events
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FROM coast to coast Americans are trying a hand at the thrilling sport of motorless flying. Here are views of the first official glider contest held by the California Gliders Association on the sand dunes near San Francisco. At the right a ground crew is catapulting one of the machines into the air by means of a towrope. Vance Breese, noted Pacific Coast pilot, is handling the craft.
PopularScience_19290401_0114_004_0033.xml
article
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34
Engineering
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Launching a 500-Ton Gate
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RESEMBLING a giant scow, this 500-ton steel gate was launched with a mighty splash recently at Brooklyn, N. Y. It is to be the portal of a new dry dock for ocean liners in the Erie Basin of New York Harbor. This dock, 715 feet long and 113 feet wide at the top, will accommodate larger vessels than any similar structure near New York.
PopularScience_19290401_0114_004_0034.xml
article
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Automobiles
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Another Speedy Challenger
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HERE is the latest speed creation of Major Malcolm Campbell, famous British driver who broke the world’s record at Daytona Beach, Fla., last year, only to be surpassed soon afterward by Ray Keech, the American. Like Maj. H. O. D. Segrave, whose new car is pictured on the opposite page, Campbell expects to capture world speed honors for England this year.
PopularScience_19290401_0114_004_0035.xml
article
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Automobiles
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Challenging U. S. Speed Records
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America's speed supremacy on land and water is being challenged this spring by the famous British racer, Maj. H. O. D. Segrave. He recently brought to America a new speed car, the Golden Arrow, and a powerful hydroplane, the Miss England. Above: Major Segrave (right) and the giant engine in his water craft, with which he expects to beat the record of 92.8 miles an hour set by Gar Wood last year.
PopularScience_19290401_0114_004_0036.xml
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Automobiles
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Robot’s Eye Controls Traffic;
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When he’s not racing, Major Segrave tinkers with a model railway for recreation. At the right he shows part of the elaborate four-track system which he has been building for fourteen years. It has bridges, tunnels, and automatic electric control devices.
PopularScience_19290401_0114_004_0037.xml
article
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New Processes and Inventions
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Train Obeys Its Master’s Voice
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PopularScience_19290401_0114_004_0038.xml
article
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Snapshots of Unusual People
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Snake Guardian a Part-Time Weather Prophet
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Weather forecasting is just part of the day's work for Raymond L. Ditmars, curator of mammals and reptiles in the New York Zoo.
PopularScience_19290401_0114_004_0039.xml
article
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36
Aviation
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A 65-Years-Old Airman
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Sixty-five years old, but as enthusiastic as any young airman, is J. L. Gray, pilot of Dallas, Tex.
PopularScience_19290401_0114_004_0040.xml
article
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36
Snapshots of Unusual People
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He's Inventor, Executive, and Rail-way Conductor
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Executive of a New York firm making his new electric steam heater for trains, W. E. Hudson keepi his job as railway conductor.
PopularScience_19290401_0114_004_0041.xml
article
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Exceptional People
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Doctor Helps Cripples with Own Free Inventions
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Dr. George D. Marshall, of Kolcomo, Ind., once a blacksmith, uses his mechanical skill to make his own orthopedic appliances to cure needy crippled children free of charge.
PopularScience_19290401_0114_004_0042.xml
article
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Snapshots of Unusual People
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World's Only Masters of Strange Inlaying Craft
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The world's only masters of buhl craft— the art of inlaying carved metal on tortoise shell—work in a shop near Paddington, Eng.
PopularScience_19290401_0114_004_0043.xml
article
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Laboratory Discoveries
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Chemist Claims New Way to Harden Precious Metals
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Seth Bert Gracier, a San Francisco chemist, claims to have discovered a way to harden gold, silver, and copper with an alloy of aluminum. Gracier is seen taking a piece of the new alloy from a crucible in his laboratory.
PopularScience_19290401_0114_004_0044.xml
article
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Snapshots of Unusual People
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Teaching a Young Gorilla Tricks
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Jules L. Buck, Camden, N. J., big game hunter who traps wild animals for ZOOS, is teaching tricks to a young gorilla captured on his latest expedition to Africa.
PopularScience_19290401_0114_004_0045.xml
article
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Unusual Facts and Ideas
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Odd as the House Jack Built
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PopularScience_19290401_0114_004_0046.xml
article
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Unusual Facts and Ideas
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Pulls Train Two Miles Long!
Latest Engine Uses Every Hour Enough Coal to Heat Two Houses All Winter
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ATWENTY-TWO-WHEELED juggernaut of the rails, the largest steam locomotive in the world, recently was delivered to the Northern Pacific Railroad. Shown above, it is the most powerful Mallettype train-puller ever built. It weighs 1,100,000 pounds and, with its tender, is 125 feet long.
PopularScience_19290401_0114_004_0047.xml
article
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Unusual Facts and Ideas
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Around the Pole in a Saucer!
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CIRCLING the North Pole in a 125-foot saucer is the recent amazing proposal of Capt. Robert A. Bartlett, Arctic veteran who commanded Peary’s polar ship Roosevelt, and whose own famous schooner, the Morrissey, has plowed repeatedly into the frozen North.
PopularScience_19290401_0114_004_0048.xml
article
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Speeding Ahead with Aviation
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America's Latest Air Liner
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America’s latest air liner—new twenty-passenger cabin monoplane on recent test flight at Newark, N.J. With ninety-foot wing spread and two 625-horsepower motors, the huge plane is designed to remain aloft twenty hours. Notice the unusually wide body shaped to increase lift.
PopularScience_19290401_0114_004_0049.xml
article
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Speeding Ahead with Aviation
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Painting On a Plane's License Plates
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Getting new license plates is one worry of motorists that doesn’t bother the airplane owner. To obey U. S. Department of Commerce rules, all he has to do is to paint new letters and numerals on his machine. Lee Wiley, a Los Angeles flyer, is seen here showing how simple it is.
PopularScience_19290401_0114_004_0050.xml
article
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Speeding Ahead with Aviation
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Gasoline Gage Marvel of Accuracy
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PopularScience_19290401_0114_004_0051.xml
article
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Speeding Ahead with Aviation
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A Revolutionary New Airplane Motor
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PopularScience_19290401_0114_004_0052.xml
article
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Speeding Ahead with Aviation
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Super-Sensitive Altimeter Detects Five-Foot Drop
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PopularScience_19290401_0114_004_0053.xml
article
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Speeding Ahead with Aviation
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A Revolutionary New Airplane Motor
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PopularScience_19290401_0114_004_0054.xml
article
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Aviation
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Mammoth Flying Hotel for 80 Passengers—A Rival "Question Mark"—Unusual Ideas and Inventions
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COLOSSAL flying hotels are reported nearing completion in Germany. Roomier and more comfortable than the Graf Zeppelin, it is said, is a heavier-than-air Dornier machine for eighty passengers, now nearing completion on the shores of Lake Constance. Weighing fifty tons, it will be four times the size of any known airplane.
PopularScience_19290401_0114_004_0055.xml
article
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Aviation
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$900,000 Wind Tunnel
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FULL-SIZED airplanes would be tested without flying them, in a $900,000 wind tunnel proposed in a bill recently reported by the House Appropriations Committee at Washington, D. C. The project calls for a tube of enormous size. Hitherto only the action of propeller and fuselage have been observed with full-scale parts, while test of a whole plane required the construction of a miniature model.
PopularScience_19290401_0114_004_0056.xml
article
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Aviation
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A Helicopter That Works?
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CLOSELY guarded from the curious, a strange flying machine is being built for the British government at Saunders Aircraft Works at Cowes, Isle of Wight. It is an improved type of "helicopter," designed by the Italian inventor, M. V. Isacco, to lift itself vertically into the air.
PopularScience_19290401_0114_004_0057.xml
article
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41
Aviation
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New Goggles for Airmen
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FIRST tests of a new anti-eyestrain type of goggles developed by the Army Air Corps at Wright Field, Dayton, O., have proved so successful that a large shipment of the eyepieces has been ordered, according to Dr. S. M. Burka, associate physicist qualified in aerial photography at the Army field.
PopularScience_19290401_0114_004_0058.xml
article
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Aviation
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Britain’s "Question Mark"
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IMPRESSED by the recent sixday flight of the American plane Question Mark, refueled from the air, Britain is going after a few endurance records with her own "Question Mark" plane. A giant Fairey monoplane, just completed, will attempt first to break the world’s nonrefueling record of sixty-five hours in the air; then it will be flown to Cape Town, South Africa, where it will attempt a nonstop return trip of some 8,000 miles—a third of the way around the earth—to London.
PopularScience_19290401_0114_004_0059.xml
article
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Aviation
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Transcontinental Air-Rail Route
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COVERED wagon—stage coach—railroad—and now it’s the air-rail! This simple map tells the latest chapter of the amazing story of progress in transcontinental travel. It shows the route of cross country air-rail service soon to operate on schedule.
PopularScience_19290401_0114_004_0060.xml
article
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42,43,44,156,157,158,159,160
LEADING ARTICLES
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The Real Fathers of Flight
How Wilbur and Orville Wright Climbed on Wings at Last—The Stirring, Inside Story of the World's First Powered Plane
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JOHN R. McMAHON
PHUT! boom! Hutphut-tut! Bang! Bang! A fat dozing policeman sprang quickly from his back - warming chimney prop and swung his club wildly. Dogs barked, a cat ran, small boys with ear muffs hurrahed, and shopkeepers in white aprons ran outdoors in the wintry air after their customers to find out the meaning of the terrible racket.
PopularScience_19290401_0114_004_0061.xml
article
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45,138
LEADING ARTICLES
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Witches-Still on the Job!
How the Human Mind, Craving Miracles, Manufactures Them and Deceives Itself
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ARTHUR A. STUART
TWO hundred and thirty-seven years elapsed between America’s two famous witchcraft trials. As a result of the first, the “witches” were hanged; as a result of the second, the people who killed the professed witch, or “hex,” were sentenced to life imprisonment.
PopularScience_19290401_0114_004_0062.xml
article
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SPECIAL FEATURES
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Back of the Month's News
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KARL VOOGHT
BEHIND every important new discovery or invention lies a story. Behind hard-sounding technical names and phrases usually can be found a wealth of wonder, adventure, and understandable knowledge. You’ll enjoy the little stories which make up this feature each month.
PopularScience_19290401_0114_004_0063.xml
article
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Health and Hygiene
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Sciences Combine to Save King George's Life
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THE daily news bulletins telling of the grim battle for the life of King George V. of England drew world-wide attention, not only because the ruler of an empire lay near death from pneumonia, but because at his bedside were gathered perhaps the greatest force of diverse sciences ever focused on one task.
PopularScience_19290401_0114_004_0064.xml
article
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Laboratory Discoveries
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Five Million Volts!
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WITHIN a quiet building in Pittsfield, Massachusetts, a group of men are experimenting with the world's most dangerous plaything. It is a 5,000,000-volt thunderbolt of laboratory lightning. Only once before has an attempt been made to produce such voltage.
PopularScience_19290401_0114_004_0065.xml
article
46
46
Astronomy
[no value]
Poison in Comets
[no value]
[no value]
[no value]
[no value]
CYANOGEN, one of the most deadly of all poisons, recently was discovered in the heads of comets by Dr. N. T. Bobrovnikoff, of Lick Observatory, by means of a spectroscope. He found also that the comet’s tail is almost equally dangerous, for it is full of carbon monoxide, the same deadly gas which is given off by an automobile exhaust.
PopularScience_19290401_0114_004_0066.xml
article
46
46,47
Health and Hygiene
[no value]
Dyeing the Blood to Keep You from Dying
[no value]
[no value]
[no value]
[no value]
ANEW scientific offensive has been launched at Stanford University, California, where two chemists are pumping dyes into the blood of rabbits, pigeons, and guinea pigs as a remedy for diphtheria, ptomaine poisoning, snake bite, and other diseases and poisons.
PopularScience_19290401_0114_004_0067.xml
article
46
46
Aviation
[no value]
Rescued from the Tree Top
[no value]
[no value]
[no value]
[no value]
It was a lucky day for Thomas Hatton, a student pilot of Scranton, Pa., when his plane crashed into a tree top at Cincinnati, O. Not only did he escape injury, but a hook-and-ladder company was there to bring him down, and a photographer was on the spot to take this unusual photograph of the rescue.
PopularScience_19290401_0114_004_0068.xml
article
47
47
Automobiles
[no value]
Oil for Auto Fuel
Running Motor Buses on Fuel Oil
[no value]
[no value]
[no value]
A YOUNG inventor from New Zealand, Ernest Godward, recently brought to America a device which he thinks may save bus owners in this country $50,000,000 a year. His invention enables the ordinary gasoline motor to run on cheap fuel oil, such as is used in oil-burning furnaces.
PopularScience_19290401_0114_004_0069.xml
article
47
47,48
Engineering
[no value]
Why Not Weld Them All?
[no value]
[no value]
[no value]
[no value]
A RECENT little newspaper item, which told of the overhauling of the British ship Fullagar, failed to express the interest with which electrical and construction engineers are waiting for complete reports on the condition of the little vessel, which is only 150 feet long.
PopularScience_19290401_0114_004_0070.xml
article
47
47
Laboratory Discoveries
[no value]
Study X-Rays Behind Barricade
[no value]
[no value]
[no value]
[no value]
Piles of sandbags and a concrete wall between operators and machine are used at California Institute of Technology, in Pasadena, to absorb the dangerous offshoots from powerful X-rays generated by 1,000,000 volts of electricity in a fifteen-foot tube, the world’s largest apparatus of its kind.
PopularScience_19290401_0114_004_0071.xml
article
47
47
Laboratory Discoveries
[no value]
Testing with Mechanical Hands
[no value]
[no value]
[no value]
[no value]
One of the newest testing devices of the U. S. Bureau of Standards, Washington, D. C., is this odd looking machine which measures the accuracy and durability of hand numbering machines used in business offices to number pages and documents.
PopularScience_19290401_0114_004_0072.xml
article
48
48
Unusual Facts and Ideas
[no value]
Benjamin Franklin’s Broom
[no value]
[no value]
[no value]
[no value]
ONE of Benjamin Franklin’s contributions to science, heretofore unnoted, was disclosed at the latest annual meeting of the National Broom Manufacturers’ Association, where an old diary was quoted, telling how a woman of Franklin’s acquaintance had sent him a whisk broom from India and so enabled him to establish the broom-corn as an American farm product.
PopularScience_19290401_0114_004_0073.xml
article
48
48
Health and Hygiene
[no value]
Key to Long Life?
[no value]
[no value]
[no value]
[no value]
DR. F. G. BANTING, Canadian discoverer of insulin, used in the treatment of diabetes, is going to investigate the life-prolonging possibilities of "royal jelly," the food provided for the queens by worker bees. This substance prolongs the life of the queen bee for several years, and Doctor Banting hopes to discover something that can be used similarly for huma beings.
PopularScience_19290401_0114_004_0074.xml
article
48
48
Laboratory Discoveries
[no value]
Tells How Wind Sways Towers
[no value]
[no value]
[no value]
[no value]
Rocked by a gale blowing seventy miles an hour, this model of a steel water tower will reveal wind pressures and strains to engineers of the U. S. Bureau of Standards at Washington. The model, shown here with Byron H. Monish, a Federal expert on winds, is placed in the Bureau’s huge wind tunnel to prove how it can stand up in a gale made to howl around it.
PopularScience_19290401_0114_004_0075.xml
article
48
48
Unusual Facts and Ideas
[no value]
The World’s Healthiest "Spuds"
[no value]
[no value]
[no value]
[no value]
Uncle Sam’s plant experts in the U. S. Department of Agriculture have developed a new variety of white potato which, they say, is immune to most of the diseases and blights that prey upon America’s tuber crop. Dr. William Stuart exhibits here a few of the world’s healthiest "spuds" he helped to grow.
PopularScience_19290401_0114_004_0076.xml
article
48
48,49
Unusual Facts and Ideas
[no value]
What Is the Right Size?
[no value]
[no value]
[no value]
[no value]
IF A man were sixty feet high he couldn’t walk. That is, he couldn’t walk without breaking his thigh bones, which will support only about ten times one’s weight without breaking. If you multiply one’s height, width, and thickness each by ten the total weight will be multiplied by a thousand, but the cross section of each bone is multiplied only by a hundred, so that each bone has to carry ten times as much strain as in the normal individual.
PopularScience_19290401_0114_004_0077.xml
article
49
49
Unusual Facts and Ideas
[no value]
New Wonders in Glass
[no value]
[no value]
[no value]
[no value]
GLASS is not nearly as leakproof as most of us think, according to Professor G. P. Baxter, Dr. H. W. Starkeweather, and Dr. R. B. Ellestad, of Harvard University. They sealed about a quart of helium gas in a globe of fireproof glass. After a year and a day they found that a little more than one percent of the gas had escaped through the tiny pores of the globe.
PopularScience_19290401_0114_004_0078.xml
article
49
49
Radio
[no value]
Radio’s Puzzles
[no value]
[no value]
[no value]
[no value]
THE United States Bureau of Standards recently announced that radio engineers confess being baffled by the problem of static. Behind that announcement lurks opportunity. The inventor of the really effective static eliminator can become a multimillionaire.
PopularScience_19290401_0114_004_0079.xml
article
49
49
Nature
[no value]
Why Sap Rises
[no value]
[no value]
[no value]
[no value]
THE mystery of the rise of sap which has puzzled scientists for years apparently has been solved. Dr. D. T. Macdougal, of the Desert Laboratory, Tucson, Ariz., recently announced his discovery that the sap is hoisted by the leaves to the tree top from above, not pushed up by the roots, as experts long believed.
PopularScience_19290401_0114_004_0080.xml
article
49
49
Astronomy
[no value]
Bolt of Iron Cast from the Sky
[no value]
[no value]
[no value]
[no value]
Australian kangaroo hunters stumbled upon this 1,400-pound meteorite which had plunged from the sky in the vicinity of Queensland. Brought to America and analyzed, it was found to contain ninety-three percent iron, some nickel and platinum, and particles of other minerals.
PopularScience_19290401_0114_004_0081.xml
article
49
49
Nature
[no value]
Fresh "Milk" Right from the Bark
[no value]
[no value]
[no value]
[no value]
"Cow trees" recently discovered in the Puerto Barrios district of Guatemala by Prof. Samuel J. Record, Yale University forestry expert, give milk that looks and tastes like the familiar dairy product and is said to be highly nutritious. This picture shows how natives "milk" the trees by gashing the bark.
PopularScience_19290401_0114_004_0082.xml
article
50
50,51,164,166,167,168,169
LEADING ARTICLES
[no value]
Cannonball Baker Automobile "Broncho Buster"
[no value]
[no value]
[no value]
HENRY MORTON ROBINSON
CANNONBALL BAKER holds more endurance and mountain-climbing records than any man who ever lived. For twenty-three years he has daringly tested the products of auto manufacturers in his whirlwind “road laboratory” of actual performance, speeding in all weathers over all kinds of roads, taking chances only with his own life.
PopularScience_19290401_0114_004_0083.xml
article
52
52
LEADING ARTICLES
[no value]
Are You in the Right Job?
Psychologists Prepare a Series of Questions That Will Help You Get a Line on Yourself
[no value]
[no value]
RUTH MOORE MORRISS
ARE you happy in your job, or do you chafe under the drudgery of your daily tasks? Do you know whether you are doing the kind of work for which you are best fitted? Science has just reduced to a minimum the guesswork in answering these questions.
PopularScience_19290401_0114_004_0084.xml
article
53
53,142
LEADING ARTICLES
[no value]
Slaying the Ice Monsters
Frozen Giants Blasted to Bits—How U. S. Patrol Boats Trail Atlantic "Growlers" and Guard Ships from Peril
[no value]
[no value]
MICHEL MOK
FOUR bergs in sight in a radius of seven miles. Fog getting dense. Danger to westbound traffic. Sixty growlers northeast Cape Race." Here is a message typical of the radio flashes that are now being received daily by the U. S. Hydrographic Office at Washington, D. C., from the International Ice Patrol.
PopularScience_19290401_0114_004_0085.xml
article
54
54
Aviation
[no value]
Wing Strength Tested by Piles of Sandbags
[no value]
[no value]
[no value]
[no value]
LOOPING-THE-LOOP and topsyturvy flying cause strains that are mild compared with those to which wings are subjected in an airplane factory at Burbank, California. Before new wings are attached to the streamline fuselage of this make of machine, they are loaded with several hundred sandbags while testing engineers watch their strain-recording instruments.
PopularScience_19290401_0114_004_0086.xml
article
54
54
Aviation
[no value]
Lindbergh’s Trophies Fill Wing of Memorial
[no value]
[no value]
[no value]
[no value]
TROPHIES filling the entire west wing of the Jefferson Memorial in St. Louis, Mo., prove the world’s esteem for Col. Charles A. Lindbergh. During his tours of Europe and Latin America after his spectacular crossing of the Atlantic Ocean in May, 1927, medals and plaques, pictures and loving cups were showered upon him.
PopularScience_19290401_0114_004_0087.xml
article
54
54
Astronomy
[no value]
How Starlight Is Measured by Photo-Electric Cell
[no value]
[no value]
[no value]
[no value]
THE light of stars is measured by photoelectric cells. Dr. Joel Stebbins, of Washburn Observatory, Madison, Wis., recently explained that a photo-electric cell is an electric lamp which works backward; in an ordinary bulb you put in current and take out light, while in the photo-electric cell you put in light and get a current dependent in intensity upon the strength of the light.
PopularScience_19290401_0114_004_0088.xml
article
54
54
Aviation
[no value]
Planes Glide into River Like Ducks
[no value]
[no value]
[no value]
[no value]
A FREIGHT car float, several hundred feet long and sixty feet wide, has been turned into a unique runway for amphibian planes by the Loening Aeronautical Engineering Co., of New York City. One end of the float is attached to the bank of the East River.
PopularScience_19290401_0114_004_0089.xml
article
54
54
Unusual Facts and Ideas
[no value]
Tests Breath of Honeybees
[no value]
[no value]
[no value]
[no value]
BY ANALYZING the breath of the honeybee, Prof. G. H. Vansell, of the University of California, discovered that in winter, when the hive is at rest, the bees absorb moisture from the air, while in summer, when they are working, they give off twenty-five times as much moisture in breathing.
PopularScience_19290401_0114_004_0090.xml
article
55
55
Aviation
[no value]
Sturdy Monoplane Wears Streamlined "Pants"
[no value]
[no value]
[no value]
[no value]
AN AIRPLANE that wears “pants” is the latest development in streamlined aircraft. Both wheels of the forward landing gear, and the struts supporting them, are incased in streamlined “trouser legs ” to reduce head resistance. Lights are provided at the top of each "leg" to aid in maneuvering the plane to a landing at night.
PopularScience_19290401_0114_004_0091.xml
article
55
55
Aviation
[no value]
Tractor Tows Out Giant 12-Passenger Plane
[no value]
[no value]
[no value]
[no value]
LIKE a tiny ant dragging a large butterfly along the ground is the small tractor which hauls a new big air liner to the starting point at the Oakland Municipal Airport, Oakland, Calif. This new twelve-passenger biplane recently took off on its first flight on a regular OaklandChicago air service.
PopularScience_19290401_0114_004_0092.xml
article
55
55
Unusual Facts and Ideas
[no value]
Test “Cast Stone” Strength With Tiny Cylinders
[no value]
[no value]
[no value]
[no value]
IN LITTLE cylinders, two inches long and two inches in diameter, “cast stone,” the new building material recently described in POPULAR SCIENCE MONTHLY, is being tested at the Bureau of Standards, Washington, D. C. Its average compressive strength was discovered to be 6,250 pounds a square inch.
PopularScience_19290401_0114_004_0093.xml
article
55
55
Aviation
[no value]
R-100 Passengers to Land on 270-Foot Mast
[no value]
[no value]
[no value]
[no value]
TWO hundred and seventy feet above ground, passengers on the British dirigible R-100 will step from the airship to the landing platform of a mooring mast recently completed at Montreal, Canada, to serve as a terminus for the sky liner on its maiden voyage from England this year.
PopularScience_19290401_0114_004_0094.xml
article
56
56
Unusual Facts and Ideas
[no value]
Tiny Propeller on Man’s Back Pushes Him Uphill
[no value]
[no value]
[no value]
[no value]
THE latest invention of the Brazilian aviation pioneer, Alberto SantosDumont, is a tiny air-cooled motor and propeller which, strapped to a man's back, pushes him uphill on skis, thus saving his energy while engaging in the sport. The single-cylinder motor, complete with gasoline tank, propeller, and framework, weighs but three pounds.
PopularScience_19290401_0114_004_0095.xml
article
56
56
Unusual Facts and Ideas
[no value]
Motor Boat Leaps Through a Hoop
[no value]
[no value]
[no value]
[no value]
DASHING over the water at thirty-five miles an hour, a tiny hydroplane, the Oh Kay, its outboard motor racing at full speed, shot up a greased slide, tore through a paper hoop, and leaped forty feet when it recently inaugurated a nerve-tingling sport on Lake Elsinore, Calif.
PopularScience_19290401_0114_004_0096.xml
article
56
56
Engineering
[no value]
New Dredge Driven by Diesel Motors
[no value]
[no value]
[no value]
[no value]
SLIDING off the ways at Manitowoc, Wis., the first of a series of unique dipper dredges, designed for Great Lakes service, struck the water of Lake Michigan recently and was started on the journey to the scene of its first operations. The new type dredge is of all-steel construction and the dipping machinery is operated by electricity generated on board.
PopularScience_19290401_0114_004_0097.xml
article
56
56
Health and Hygiene
[no value]
Finds Some Germs Prefer Blonds for Victims
[no value]
[no value]
[no value]
[no value]
GERMS also prefer blonds. In choosing a victim, the chainlike bacteria streptococci, which infect man with various diseases, pick a person with a light skin rather than one with dark, according to Dr. Samuel J. Holmes, of the Department of Zoology, University of California.
PopularScience_19290401_0114_004_0098.xml
article
56
56
Astronomy
[no value]
Pinpoint Device Registers Heat from Far Suns
[no value]
[no value]
[no value]
[no value]
AN INSTRUMENT so small it would take a thousand to equal the size of a drop of water was used recently by Dr. Edison Pettit and Dr. Seth Nicholson, at Mt. Wilson Observatory, to measure the heat of stars billions of miles away (This device was constructed under a microscope.
PopularScience_19290401_0114_004_0099.xml
article
56
56
Unusual Facts and Ideas
[no value]
Use Poison Gas to Rout Foes of Pineapples
[no value]
[no value]
[no value]
[no value]
A POISON gas offensive is being waged by pineapple growers in the Hawaiian Islands against the nematode, a worm pest that attacks the roots of both pineapples and sugar cane, destroying from fifty to ninety percent of the crop. Multiplying rapidly, the plant enemies have increased tremendously in recent years.
PopularScience_19290401_0114_004_0100.xml
article
57
57
Automobiles
[no value]
Gilded Auto of 1903 Still Runs in Fine Style
[no value]
[no value]
[no value]
[no value]
TWENTY-FIVE years old and still going strong! That is the record of an early steam automobile in Los Angeles, Calif., which still is able to bowl along the streets of that city at a good speed. The original owner of the machine is not known, although he is believed to have been the president of a western railway.
PopularScience_19290401_0114_004_0101.xml
article
57
57
Exceptional People
[no value]
Builds Sailing Yacht of Turkey Bones
[no value]
[no value]
[no value]
[no value]
A THANKSGIVING turkey furnished the keel for an unusual model yacht built by Harry Bock, a workshop enthusiast of Manchester Center, Vt. Upon the polished breast bone, the deck and masts were fastened. Smaller bones from the breast were used as spars to tauten the rigging of the miniature sails.
PopularScience_19290401_0114_004_0102.xml
article
57
57
Unusual Facts and Ideas
[no value]
These "Cukes" Cannot Fail
[no value]
[no value]
[no value]
[no value]
A NEW hybrid variety of cucumber whose flowers do not have to be pollinated was described recently by Prof. Richard Wellington and Leslie K. Hawthorn, of the New York State Agricultural Experiment Station. The certainty of a crop is assured by this new species, they declared.
PopularScience_19290401_0114_004_0103.xml
article
57
57
Unusual Facts and Ideas
[no value]
Plans to Use Tung Nuts for Making Paint Oil
[no value]
[no value]
[no value]
[no value]
OIL from Chinese tung nuts, which long has been used in paints and varnishes, will be produced on a large scale by T. Morris Carnegie, nephew of the late Andrew Carnegie, famous steel maker and philanthropist, if experiments being carried out on his estate near Fernandina, Fla., prove successful.
PopularScience_19290401_0114_004_0104.xml
article
57
57
Health and Hygiene
[no value]
Can You Give a Name to Ultra-Violet Ray?
[no value]
[no value]
[no value]
[no value]
SCIENCE needs another word to designate what we now call ultra-violet light. “Ultraviolet” simply means “beyond the violet” band of the solar spectrum, which indicates that the rays are invisible and so are not light at all in the ordinary sense of the word.
PopularScience_19290401_0114_004_0105.xml
article
57
57
Aviation
[no value]
Sign of the Pawnbroker Urged as Air Marker
[no value]
[no value]
[no value]
[no value]
NEW shapes and colors of glass are being sought for airway markers. How to mark radio antenna poles is a particular problem. Lights at the top are likely to cause mterference. Floodlights at the bottom do not reveal the tips with sufficient clearness.
PopularScience_19290401_0114_004_0106.xml
article
57
57
Unusual Facts and Ideas
[no value]
Electrified Water Keeps Fish Out of Ditches
[no value]
[no value]
[no value]
[no value]
AMAZING screens formed by streaming particles of electrified water are being used in the Northwest to keep young trout and salmon out of irrigation ditches. When schools of these fish stray into the ditches, loss results to the fishing industry, so experts of the Federal Bureau of Fisheries have been investigating to find the best method of turning them back at the mouth of a ditch.
PopularScience_19290401_0114_004_0107.xml
article
58
58
Health and Hygiene
[no value]
Boys Build "Human Engine" in Study of Anatomy
[no value]
[no value]
[no value]
[no value]
USING two furnaces for the stomach, twin bellows for the lungs, a little pumping engine for the heart, and other mechanical devices for various organs of the body, British schoolboys, studying anatomy, constructed a mechanical man to illustrate the functions of these organs by machinery.
PopularScience_19290401_0114_004_0108.xml
article
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58
Unusual Facts and Ideas
[no value]
Nitrates from Africa
[no value]
[no value]
[no value]
[no value]
NITRATES essential in producing explosives in war time and valuable as a fertilizer in peace have been discovered in Southwest Africa, it is reported. Practically the whole supply in the past has come from the famous nitrate mines of Chile, in South America.
PopularScience_19290401_0114_004_0109.xml
article
58
58
Aviation
[no value]
Graf Zeppelin to Explore Arctic Near Alaska
[no value]
[no value]
[no value]
[no value]
IN APRIL, 1930, the great German dirigible Graf Zeppelin will point its nose toward the Arctic, according to Dr. Fridtjof Nansen, famous Scandinavian explorer, who will command the expedition. The airship will be used by the AeroArctic Society in exploring unmapped territory northeast of Alaska.
PopularScience_19290401_0114_004_0110.xml
article
58
58
Nature
[no value]
First American Cat Had Teeth Like Daggers
[no value]
[no value]
[no value]
[no value]
ALLL modern cats, from tabbies to Angoras, are believed by Paul C. Miller, associate curator of paleontology at the University of Chicago, to have descended from a prehistoric feline whose bones he found recently in Nebraska. For thirteen summers he searched for the big cat of antiquity he believed had roamed over the western plains 10,000,000 years ago.
PopularScience_19290401_0114_004_0111.xml
article
58
58
Health and Hygiene
[no value]
Three Chemicals of Life Flow in Our Blood
[no value]
[no value]
[no value]
[no value]
THE three chemicals which play leading roles in keeping us alive, blood specialists have decided, are hemoglobin, chlorophyll, and a phosphorus compound, still virtually unknown. This trio gives the blood stream its power. Hemoglobin, the red blood chemical, supplies iron to the vital current.
PopularScience_19290401_0114_004_0112.xml
article
58
58
Unusual Facts and Ideas
[no value]
Hoard in England Adds to Bronze Age Mystery
[no value]
[no value]
[no value]
[no value]
THE so-called Bronze Age is generally believed to have been the stage in human culture intermediate between the Stone and Iron Ages, and to have lasted approximately from 2,000 B.C. until 1,800 B.C. Many archeologists of note, however, doubt that there ever was a distinctive bronze era, but contend that the three ages more or less overlapped, basing this belief on the fact that bronze implements have been found in ancient burial places side by side with iron and, sometimes, even stone ones.
PopularScience_19290401_0114_004_0113.xml
article
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58
Nature
[no value]
Python Takes Whole Deer at One Gulp
[no value]
[no value]
[no value]
[no value]
A WHOLE deer disappeared down the throat of a huge python in the Malay States recently, according to the report of hunters who watched the record-breaking meal and then killed the serpent as it lay in a sluggish state while digesting the animal.
PopularScience_19290401_0114_004_0114.xml
article
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59
Unusual Facts and Ideas
[no value]
Five Years' Work to Quarry One Block of Marble
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[no value]
[no value]
[no value]
THREE thousand feet above the sea in the Italian Alps, workmen in the famous Carrara quarries drilled and cut for five years to carve from a mountain what is believed to be the world’s largest monolith of marble. This white stone block, nearly ten feet square and sixty feet long, has been presented to Mussolini for erection as a monument in Rome.
PopularScience_19290401_0114_004_0115.xml
article
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59
Unusual Facts and Ideas
[no value]
Gas Blows Up Mile of London Streets
[no value]
[no value]
[no value]
[no value]
A MILE of London streets exploded recently. With a series of roars like four huge bombs being, set off, one after the other, an underground gas main burst in the west central section of the British capital. The rushing clouds of inflammable gas ignited and, in an instant, tongues of vivid flame were shooting sixty feet into the air—higher than some near-by buildings.
PopularScience_19290401_0114_004_0116.xml
article
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59
Unusual Facts and Ideas
[no value]
Old Letter May Tell Secret of "Strad"
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[no value]
[no value]
[no value]
IF A yellow sheet of crumbly paper found recently in the secret drawer of an old desk at Bergano, Italy, turns out to be what musicians hope it is, every aspiring young violinist soon will play upon a coveted "Strad." An antiquarian, examining the piece of furniture, accidentally came upon a letter written by Antonio Stradivari, the master violin maker of Cremona, to a priest, setting forth in detail the methods of wood-treating and varnishing he used more than 200 years ago in the production of his matchless instruments.
PopularScience_19290401_0114_004_0117.xml
article
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59
Unusual Facts and Ideas
[no value]
Would Banish Cupid for Rule of Eugenics
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[no value]
[no value]
[no value]
TO LEAVE all matters concerning future generations to Nature is an error, in the belief of Ralph E. Danforth, of Chesterfield, Mass., an authority on eugenics, who holds the aim of eugenics is to improve the human race and make its individuals worthy of being loved.
PopularScience_19290401_0114_004_0118.xml
article
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60
Unusual Facts and Ideas
[no value]
Electric "Bos’n" Shouts Orders on Warship
[no value]
[no value]
[no value]
[no value]
WITH ninety "tongues" singing out orders at the same time, an "electric boatswain’s mate," recently installed on large British warships, spreads the command over all parts of a vessel within a few seconds. Directions for the crew are spoken into a microphone and transmitted through the ninety loudspeakers placed at different positions on the ship.
PopularScience_19290401_0114_004_0119.xml
article
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Unusual Facts and Ideas
[no value]
Quake Takes a Short Cut Through Earth’s Center
[no value]
[no value]
[no value]
[no value]
TRAVELING from the Malay Peninsula to Massachusetts, vibrations of a recent earthquake passed through the center of the globe, according to seismographic records at Harvard University. Verification of the phenomenon comes from similar records at Georgetown University, Washington, D. C.
PopularScience_19290401_0114_004_0120.xml
article
60
60
Unusual Facts and Ideas
[no value]
Angel Fish Bring Deadly Bacillus to Aquarium
[no value]
[no value]
[no value]
[no value]
ASTRANGE marine bacillus which causes blindness and death to fish recently killed more than 400 specimens at the Aquarium, in New York City, before the epidemic could be stamped out. Angel fish from Key West waters are believed to have brought the deathdealing malady with them.
PopularScience_19290401_0114_004_0121.xml
article
60
60
Photography
[no value]
Sound Films to "Talk" in Testing Studio
[no value]
[no value]
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[no value]
A THREE-STORY laboratory, to be devoted wholly to the study of problems in connection with talking movies, is being constructed by the Bell Telephone Laboratories in New York City. Facilities for the complete production of sound films for experimental purposes will form part of the equipment.
PopularScience_19290401_0114_004_0122.xml
article
60
60
New Processes and Inventions
[no value]
Ready-Lighted Cigarettes Pop from This Holder
[no value]
[no value]
[no value]
[no value]
PRESS down the lever of a new cigarette box and out comes a cigarette already lighted! The movement of the lever releases a single cigarette, allowing it to drop upon holders, and at the same time ignites a lighter, similar in action to an ordinary pocket lighter.
PopularScience_19290401_0114_004_0123.xml
article
60
60
New Processes and Inventions
[no value]
Deliveries Locked Up by Kitchen-Wall Receiver
[no value]
[no value]
[no value]
[no value]
TO SAVE steps and protect packages left when no one is home are the purposes of a device designed to be installed in the kitchen wall. It is a compartment with two doors, one outside the house, the other within the kitchen. When groceries, bottles of milk, or parcels are deposited in the receiver, closing of the outside door locks it automatically, the maker explains, thus protecting the articles from theft.
PopularScience_19290401_0114_004_0124.xml
article
60
60
Unusual Facts and Ideas
[no value]
How Much Do You Know About Physics?
[no value]
[no value]
[no value]
[no value]
HERE are ten questions selected from hundreds asked by our readers. See how many you can answer. Correct answers are on page 143. 1. What is the difference between chemistry and physics? 2. What is a vacuum? 3. How does a thermometer tell temperature?
PopularScience_19290401_0114_004_0125.xml
article
61
61
Automobiles
[no value]
Know Your Car
[no value]
[no value]
[no value]
[no value]
THE function of a car's cooling system is the transfer of excess motor heat to air flowing through the radiator. Assuming that the cooling system keeps the motor at proper running temperature in the hottest weather, it is neither necessary nor desirable to put anything in the radiator except pure water.
PopularScience_19290401_0114_004_0126.xml
article
61
61
New Processes and Inventions
[no value]
Devises Weights to Stop Trains from Crashing
[no value]
[no value]
[no value]
[no value]
SOMETHING new in the way of safety appliances to reduce railway accidents has been devised by G. S. Oliver, an Englishman, in the form of a mechanical device to prevent train collisions at crossings. Using two toy engines on tracks that crossed, Oliver recently demonstrated his theory that levers attached to heavy rolling weights placed at intervals along the rails would stop locomotives from colliding.
PopularScience_19290401_0114_004_0127.xml
article
61
61
Unusual Facts and Ideas
[no value]
Finds Germs Existed Before Dinosaurs
[no value]
[no value]
[no value]
[no value]
GERMS have outlived the dinosaurs. While the huge monsters of the past have vanished from the animal world, microscopic bacteria have continued to live with but slight changes for millions of years, Prof. T. Brailsford Robertson, of the Wistar Institute, Philadelphia, recently reported.
PopularScience_19290401_0114_004_0128.xml
article
61
61
New Processes and Inventions
[no value]
Lock-It-Open Latch Foils Winds and Robbers
[no value]
[no value]
[no value]
[no value]
TO PREVENT a window from rattling and to hold it securely so it cannot be raised further from the outside when opened a few inches for ventilation, an ingenious window lock has been invented by Joseph Neiser, of London, Ohio. His latch consists of a right angle rod which fastens into a slot in the side of the upper sash.
PopularScience_19290401_0114_004_0129.xml
article
61
61
New Processes and Inventions
[no value]
Automatic Device Sends Out S O S Calls
[no value]
[no value]
[no value]
[no value]
WITHOUT a knowledge of radio or code signal, anyone now can send out distress signals from a ship or airplane, it is announced. The signal gives the position of the craft and its call letters in the international radio code, all automatically.
PopularScience_19290401_0114_004_0130.xml
article
61
61
Nature
[no value]
"Sneezing" Plants Spray Their Seeds into Air
[no value]
[no value]
[no value]
[no value]
SNEEZING plants that spray their seeds into the air with each "kachoo” are described by Herbert H. Whetzel, professor of plant pathology at Cornell University, Ithaca, N. Y. They are various types of destructive fungi. Their cup-shaped seed holders are filled with tiny pods, each containing eight seeds.
PopularScience_19290401_0114_004_0131.xml
article
61
61
Unusual Facts and Ideas
[no value]
Wanted—Three-Eyed Fish!
[no value]
[no value]
[no value]
[no value]
ONE thing biologists want to see is a three-eyed fish. Dr. E. W. Gudger, of the American Museum of Natural History, New York City, has a photograph of a haddock with three eyes, but the original specimen never came under scientific observation.
PopularScience_19290401_0114_004_0132.xml
article
62
62,63
SPECIAL FEATURES
[no value]
Getting the Best Tone from Dynamic Speakers
How to Build a Simple and Attractive Baffle Board That Will Give Natural Reproduction of Radio Voice and Music
[no value]
[no value]
ALFRED P. LANE
I'M GETTING plumb discouraged," complained a radio dealer to me the other day. "There's some funny angles to this radio business, and the question of tone quality sure heads the list." "What's so funny about tone quality?" I asked him. "Well," he explained, "it’s like this.
PopularScience_19290401_0114_004_0133.xml
article
64
64
How to Hook a Phonograph to Your Set
[no value]
Useful Ideas for Radio Fans
Electrical Pick-up Simplified—The Secret of Good Tone Quality—Special Receivers for Special Needs
[no value]
[no value]
[no value]
THE conventional method of hooking the electric phonograph pick-up to the radio receiver is to substitute a special plug for the tube in the detector socket. This method gives good results but is somewhat inconvenient because of the necessity of removing the tube each time you wish to shift from radio reproduction to phonograph record reproduction.
PopularScience_19290401_0114_004_0134.xml
article
64
64
Radio
[no value]
Tone Quality from Records
[no value]
[no value]
[no value]
[no value]
MODERN methods of electrical recording give us phonograph records that contain in the wavy grooves a remarkably true record of the actual music or speech. However, the electrical pickup is no miracle worker. All it can do is to convert the mechanical motion of the needle into equivalent electrical impulses, and the tone quality of the music issuing from your loudspeaker will depend on how accurately you amplify these impulses to loudspeaker volume.
PopularScience_19290401_0114_004_0135.xml
article
64
64
Radio
[no value]
A B C’s of Radio
[no value]
[no value]
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THE component parts of a receiving set are made of materials chosen because of their ability to carry electric current or to resist its flow. Thus connecting wires are of copper, and condenser plates of brass or aluminum, because these have little resistance to the flow of current, whereas bakelite, hard rubber, fiber board, wood, and glass are used to stop current flow.
PopularScience_19290401_0114_004_0136.xml
article
64
64
Radio
[no value]
Special Receivers
[no value]
[no value]
[no value]
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WHILE the radio demands of most people are supplied by the conventional radio receiver, there are many cases where a special receiver can be designed that will give more satisfactory results. For example, take the case of a partly deaf person located reasonably near a number of broadcasting stations.
PopularScience_19290401_0114_004_0137.xml
article
65
65
SPECIAL FEATURES
[no value]
Three Ways to Build a Radio
You Can Be Your Own Designer, Follow a Blueprint, or Assemble a Kit Set—Which? Here Is the Answer
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[no value]
JOHN CARR
YOU can tackle the problem of building yourself a radio receiver in any one of three different ways. If you understand what each component in the radio circuit actually accomplishes, you can design your own receiver. This means working out a circuit that will meet your particular requirement, choosing apparatus based on the electrical characteristics of the parts available, and then proceeding with the construction and wiring of the receiver according to your own ideas.
PopularScience_19290401_0114_004_0138.xml
article
66
66
Engineering
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England Seeks Fog-Proof Building Materials
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[no value]
A BATTLE against the atmosphere is being carried on by Great Britain through its Department of Scientific and Industrial Research. At Watford, north of London, experts in the Building Research laboratories of the government are seeking better building materials to fight the crumbling effect of England's foggy weather.
PopularScience_19290401_0114_004_0139.xml
article
66
66
Unusual Facts and Ideas
[no value]
Discovers Vast Plateau on Brazilian Border
[no value]
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A FERTILE plateau, larger than the state of Maryland, was discovered recently on the border between Brazil and Dutch Guiana by a Brazilian army officer, General Candido Rondon, while making a survey of that unexplored region. After penetrating into the jungles north of the Amazon, he reports he emerged upon "a vast plain of rich pasturage." Its extent, he believes, is at least 15,000 square miles. General Rondon was one of the men who accompanied Theodore Roosevelt down the River of Doubt.
PopularScience_19290401_0114_004_0140.xml
article
66
66
[no value]
[no value]
Physician Feeds Patient Through Pores in Skin
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TURNING back time perhaps a billion years, when the earth’s earliest inhabitants, the protozoa, or unicellular animals, absorbed food through their microscopic bodies, Dr. Karl Stejskal, a Viennese physician, recently demonstrated that the pores of the human skin will act as mouths, and that man may be fed through any part of his body.
PopularScience_19290401_0114_004_0141.xml
article
66
66
Nature
[no value]
Zoologists Seek to Save Whale from Extinction
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WHALES are in danger of extinction, according to Dr. A. Brazier Howell, zoologist at Johns Hopkins University. Modern power boats and improved equipment, he points out, have increased the catch until nearly 30,000 of the oil-producing mammals are now killed each year, whereas, during the entire forty years when Yankee whaling was at its peak, not more than 100,000 whales were killed.
PopularScience_19290401_0114_004_0142.xml
article
66
66
Engineering
[no value]
Six-Ton Slate Block Hoisted from Quarry
[no value]
[no value]
[no value]
[no value]
HOISTED like a fish at the end of a long line, a six-ton block of slate recently was removed from the bottom of an 800-foot quarry in Pennsylvania. Subsequently the slate was cut up into small pieces for roofing. Workmen with thin, broad wedges split out the layers.
PopularScience_19290401_0114_004_0143.xml
article
66
66
Nature
[no value]
Walnut Trees Kill Plants
[no value]
[no value]
[no value]
[no value]
AS EVERY woodsman knows, vegetation will not grow under walnut trees. A chemical poison exuded by the walnut tree is responsible, Everett F. Davis, of the Virginia Agricultural Experiment Station, has discovered. He succeeded in isolating this substance, which he has named "juglone."
PopularScience_19290401_0114_004_0144.xml
article
67
67
Radio
[no value]
Researchers Baffled by Six Radio Mysteries
[no value]
[no value]
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RADIO researchers are looking for answers to numerous questions, among them ones such as: Is there any difference between transmission of radio waves in the direction of the earth's rotation and the other way about? Some recent Marconi experiments indicate that there is.
PopularScience_19290401_0114_004_0145.xml
article
67
67
Unusual Facts and Ideas
[no value]
Tear Gas Warns of Poison
[no value]
[no value]
[no value]
[no value]
THE inclusion of tear gas in poisonous fumigation used to kill microbes and rodents on vessels is suggested by the U. S. Public Health Service. A slight amount of this gas, the Service points out, will serve as a warning to persons who may be in the holds and thus prevent fatalities.
PopularScience_19290401_0114_004_0146.xml
article
67
67
Unusual Facts and Ideas
[no value]
Sandbags to Strengthen Wrists of Pianists
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[no value]
[no value]
[no value]
PIANISTS can play better if they suspend sandbag weights from their wrists during practice periods. This is the belief of Huston Ray, a musician of Los Angeles, Calif., who has devised a unique aid to piano students in the form of six-pound leather bags weighted with sand.
PopularScience_19290401_0114_004_0147.xml
article
67
67
New Processes and Inventions
[no value]
Divider Slices Pies into Cuts of Equal Size
[no value]
[no value]
[no value]
[no value]
TAKING the guesswork out of cutting pie and cake, a new device assures restaurant patrons that they will receive pieces of equal size, says its maker. The pie or cake to be cut is held firmly upon a turntable by adjustable fingers. After an index lever governing the number of cuts has been set, a knife slipped into the blade guide slices out the pieces, a lever moving the turntable ahead after each movement of the knife.
PopularScience_19290401_0114_004_0148.xml
article
67
67
Unusual Facts and Ideas
[no value]
Want White Hair? Then Use X-Ray "Bleach"
[no value]
[no value]
[no value]
[no value]
IS YOUR hair turning prematurely gray? Then it’s a pretty safe guess that one of your parents had hair of a color different from yours. At least, that is the conclusion reached by zoologists of the University of Pittsburgh after a series of tests they conducted to ascertain why the hair of some persons turns gray or white sooner than that of others.
PopularScience_19290401_0114_004_0149.xml
article
67
67
Exceptional People
[no value]
Paints "Einstein" Pictures of "Energy" in Art
[no value]
[no value]
[no value]
[no value]
ART paintings that display moving, animated figures, to the accompaniment of a grinding noise of machinery, are the invention of Alexander Archipenko, Ukrainian artist. His new form of art, which he styles "Archipentura," was exhibited recently in New York.
PopularScience_19290401_0114_004_0150.xml
article
67
67
Health and Hygiene
[no value]
Sees "Magic" in Medicine
[no value]
[no value]
[no value]
[no value]
WITH all the advance made by science, medical practice still deals largely in magic, in the opinion of Prof. Lynn Thorndike, noted historian of Columbia University. “A confidence game is practiced on the patient, who must be cheered and distracted,” he says. Sending a man to Florida or out to play golf is on a par with the ancient practices of the medicine men, but both inspire confidence that the patient is going to get well, Thorndike declares.
PopularScience_19290401_0114_004_0151.xml
article
68
68
New Processes and Inventions
[no value]
Dials Show Time-Table of Trains at a Glance
[no value]
[no value]
[no value]
[no value]
PERSONS who have difficulty in figuring out the intricacies of a timetable will be interested in an automatic device which is a unique feature of the Piccadilly Underground Station, recently opened in London. A complete timetable is always before the eyes of passengers waiting for subway trains.
PopularScience_19290401_0114_004_0152.xml
article
68
68
Unusual Facts and Ideas
[no value]
Underground Gold Vault Rivals Hugo’s Fiction
[no value]
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[no value]
THE fiction of Victor Hugo and Eugene Sue. in which thrilling and mysterious doings in the maze of sewers and tunnels underneath Paris are described, has been rivaled by fact. The Bank of France, after three years of work by nearly 1,500 men, has completed construction of a subterranean hiding place for the $1,000,000,000 gold reserve of France which, for imagination of design and ingenuity of construction, surpasses anything conceived by those famous romancers.
PopularScience_19290401_0114_004_0153.xml
article
68
68
New Processes and Inventions
[no value]
Folding Bicycle Carried Like a Typewriter
[no value]
[no value]
[no value]
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A COLLAPSIBLE bicycle which can be ridden to a station, folded up, and taken on a train in a small suitcase has been brought out by a French bicycle maker. He expects it to be popular among city dwellers who have no space in their apartments to store a full-sized machine, but would like to ride a bicycle to work or to and from the station when traveling.
PopularScience_19290401_0114_004_0154.xml
article
68
68
[no value]
[no value]
Newspapers from Cornstalks
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NEWSPAPERS, magazines, and a book, recently made from cornstalks, represent the latest step in utilizing waste products of the farm. In the pressroom of a newspaper plant at Danville, III., cornstalk paper was tested for the first time in actual competition with wood-pulp paper and the results are said to have proved satisfactory. Further tests are being made, to determine whether large-scale production of the cornstalkpulp paper will prove economical.
PopularScience_19290401_0114_004_0155.xml
article
68
68
Unusual Facts and Ideas
[no value]
The Same Old Money, but in Smaller Paper Bills
Information Available
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[no value]
[no value]
ALL of us, no matter how blessed with this world’s goods, soon will have less money. The new currency to be put in circulation this year will measure six and five sixteenths by two and eleven sixteenths inches. Our present bills measure seven and three eighths by three and one eighth inches.
PopularScience_19290401_0114_004_0156.xml
article
69
69
Exceptional People
[no value]
Mail Carrier Has “Circled Earth” Seven Times
[no value]
[no value]
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[no value]
ALKING a sufficient number of miles within the city limits of Baltimore, Md., to have circled the globe seven times and have 4,000 miles left over for good measure is the remarkable record of a mail carrier who has just decided that his feet need a rest and has retired from the postal service.
PopularScience_19290401_0114_004_0157.xml
article
69
69
Exceptional People
[no value]
Pedals 175,000 Miles on Bicycles in 20 Years
[no value]
[no value]
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[no value]
WEARING out three bicycles in twenty years, Charles A. Stoops, former Chief of Police at Easton, Md., has pedaled 175,000 miles, more than most motorists would drive a car in the same length of time. Statistics show that the average automobile owner drives approximately 8,000 miles a year.
PopularScience_19290401_0114_004_0158.xml
article
69
69
New Processes and Inventions
[no value]
Crashless Crossing Gate Bends Like a Bow
[no value]
[no value]
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A NEW safety railway crossing gate, shaped like a violin bow, is designed to prevent motorists crashing through onto the track, as occasionally happens with ordinary wooden gates. The “string” of the bow is composed of two tightly stretched steel cables supported by a frame of spring steel forming the curved bow.
PopularScience_19290401_0114_004_0159.xml
article
69
69
Exceptional People
[no value]
A Riveter for 50 Years, He Claims the Record
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IF YOUR nerves jump at the staccato noise of the riveters at work on a new steel building, you can appreciate something of the job of Edward Fay, of New York City, who listens to that music almost every day. He has been a riveter for fifty years. Fay, who is sixty-five years old, claims the distinction of being the oldest riveter still on the job.
PopularScience_19290401_0114_004_0160.xml
article
69
69
Laboratory Discoveries
[no value]
Smallest Torch Reveals Microscopic Life
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[no value]
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[no value]
THE world’s tiniest torch—a light so small that it will illuminate the interior of a single living cell under a microscope—is proving an aid to laboratory investigation at the University of Pittsburgh. The instrument consists of two pencil-shaped pieces of quartz put together like pincers with the points, which were drawn down finer than those of needles, coming together.
PopularScience_19290401_0114_004_0161.xml
article
69
69
[no value]
[no value]
Gas Masks to Be Used in Fight on Hay Fever
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GERMAN scientists have adapted the gas mask of World War fame to use in the battle against flower pollens that cause hay fever and which are believed responsible for asthma. The new mask filters the pollen out of the air just as the war mask did poisonous gas.
PopularScience_19290401_0114_004_0162.xml
article
70
70
Photography
[no value]
Aerial Camera Snaps New Canyon Bridge
[no value]
[no value]
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HOW a man-made spider’s web appears to a man-made bird is revealed in a remarkable photograph taken recently from an airplane flying above the Marble Gorge of the Grand Canyon of the Colorado, in the northwestern part of Arizona. It shows the steel span of the new highway bridge being completed across the Gorge below Lee's Ferry.
PopularScience_19290401_0114_004_0163.xml
article
70
70
Unusual Facts and Ideas
[no value]
Detects Secret Message by Shading of the Ink
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[no value]
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[no value]
IF EVER you have occasion to include a secret message in a letter be sure to write the entire missive with a well-filled fountain pen and not with an ordinary pen which has to be dipped into ink. A British handwriting expert discovered the other day that part of a letter consisted of a secret message by studying the manner in which the writer had replenished his pen.
PopularScience_19290401_0114_004_0164.xml
article
70
70
Unusual Facts and Ideas
[no value]
Gunny Sacks from Banana Trees
[no value]
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BANANA trees may yield fibers to take the place of jute in the manufacture of gunny sacks used to carry produce all over the world, if hopes of Brazilian textile men are realized. An invention for utilizing the tree fibers for this purpose was described recently at Rio de Janeiro.
PopularScience_19290401_0114_004_0165.xml
article
70
70
Unusual Facts and Ideas
[no value]
A Trainload of Gasoline Goes Up in Smoke
[no value]
[no value]
[no value]
[no value]
A $60,000 pillar of smoke darkened the sky at Zyba, Kansas, following a recent railroad wreck in which twentyseven tank cars, filled with gasoline, jumped the track, piled in a tangle, and burst into flames. All of the valuable cargo, on its way north from the oil fields of Oklahoma, was destroyed by the fire.
PopularScience_19290401_0114_004_0166.xml
article
70
70
Unusual Facts and Ideas
[no value]
Lower California Is Rising from Sea
[no value]
[no value]
[no value]
[no value]
LOWER California is steadily rising from the sea, according to a report of the National Geographic Society. The area of the fingerlike peninsula, surveys have shown, is increasing, while the Gulf of California, separating it from the mainland of Mexico, is losing width and depth.
PopularScience_19290401_0114_004_0167.xml
article
70
70
Astronomy
[no value]
Light from Tumbling Suns Arrives in 800 Years
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IN THE year 2729, some astronomer will be able to ascertain whether two giant suns, which were seen rolling around each other in space a few weeks ago, actually existed in 1929, when they were observed for the first time, or whether they passed out of the universe centuries before.
PopularScience_19290401_0114_004_0168.xml
article
71
71
Aviation
[no value]
War Birds Flit from. Floating Nest Built Like Dovecote
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ONE of the great floating nests for war birds is the British airplane carrier Furious, which is equipped with many devices to increase the efficiency of machines flying at sea. The "roof" of the vessel forms the broad expanse for the oceanic flying field.
PopularScience_19290401_0114_004_0169.xml
article
71
71
Nature
[no value]
Salamanders Grow Eyes
[no value]
[no value]
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"EYELESS" salamanders, born in deep caves, develop eyes when reared in the light, according to G. K. Noble and Sarah H. Pope, of the American Museum of Natural History. The organs of vision, apparently lost, are merely dormant, they found.
PopularScience_19290401_0114_004_0170.xml
article
71
71
Aviation
[no value]
Huge Searchlight’s Beam Will Guide Air Liners
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YOU can stand upright within an immense searchlight recently completed in England for use at the famous Croydon Airport. It is seven feet six inches in diameter and, mounted on its platform, stands fourteen feet high. The operator of the huge night guide for passenger air liners sits upon a seat above the platform and directs the beam of light by means of cranks and gears.
PopularScience_19290401_0114_004_0171.xml
article
71
71
Unusual Facts and Ideas
[no value]
Finds Babies Are Normal Despite Parents’ Ages
[no value]
[no value]
[no value]
[no value]
THE ages of parents at the time of a baby’s birth have no bearing upon the normality or lack of it in the individual, nor does it make any difference whether one is oldest or youngest in a large family, Dr. Madge Thurlow Macklin, of the University of Western Ontario Medical School, recently reported as the result of extensive observation of 111 pairs of twins.
PopularScience_19290401_0114_004_0172.xml
article
71
71
Nature
[no value]
Whale Eats Millions of Shrimp for Lunch
[no value]
[no value]
[no value]
[no value]
LESS than two dozen shrimp are needed to make you a satisfying salad, but the whale, largest animal alive, which curiously enough dotes on these little creatures, eats millions of them alive for his daily luncheon. A group of scientists just returned to England from an expedition to the Antarctic, now the greatest whaling ground, reported that the huge sea beasts there live almost exclusively on a variety of very small shrimp, which they swallow alive by millions.
PopularScience_19290401_0114_004_0173.xml
article
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72
Unusual Facts and Ideas
[no value]
Bathing Beauties Skate on Sunproof "Ice"
[no value]
[no value]
[no value]
[no value]
SKATING in bathing suits on a glaze of chemical ice that the sun cannot melt is the latest sport in the moving picture colony at Hollywood, Calif. Surrounded by palms and other tropical foliage, the skaters glide and circle in the joyous pastime of colder climates.
PopularScience_19290401_0114_004_0174.xml
article
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72
New Processes and Inventions
[no value]
Double-Walled Pot Keeps Flowers Watered
[no value]
[no value]
[no value]
[no value]
A DOUBLE-WALLED flowerpot, the inner part porous and the outer waterproof, with the two united at the top by a flat rim, was described recently by Dr. J. Dean Wilson, of the Ohio Agricultural Experiment Station, who said that extensive experiments proved its usefulness in automatically irrigating plants growing in it.
PopularScience_19290401_0114_004_0175.xml
article
72
72
Unusual Facts and Ideas
[no value]
One Twist of the Wrist Sprinkles 10 Acres
[no value]
[no value]
[no value]
[no value]
LIKE turtles drawing in their heads and closing their shells, automatic sprinklers installed recently in the sheep meadow at Central Park, New York City, disappear into the ground and pull tight coverings over themselves to give the meadow a smooth surface when the water is shut off.
PopularScience_19290401_0114_004_0176.xml
article
72
72
Aviation
[no value]
Chicago "Hub" for Planes Flying 565,406 Miles
[no value]
[no value]
[no value]
[no value]
OVER the airways that lead out of Chicago like the spokes of a wheel, mail, passenger, and express planes fly 565,406 miles a month. Fourteen companies, according to the American Air Transport Association, operate lines out of this one city.
PopularScience_19290401_0114_004_0177.xml
article
72
72
Photography
[no value]
Tiny Camera Photographs Inside of Stomach
[no value]
[no value]
[no value]
[no value]
A TINY camera, which takes sixteen pictures of the inside of the stomach on films with a total area less than that of a postage stamp, was swallowed recently by a convict at Sing Sing Prison, New York, in a demonstration before a meeting of medical men.
PopularScience_19290401_0114_004_0178.xml
article
73
73
Unusual Facts and Ideas
[no value]
Church Manufactures Its Stained Glass Windows
[no value]
[no value]
[no value]
[no value]
STAINED glass windows which beautified medieval cathedrals, though exquisite in coloring and design, were not meant primarily for decorations, but rather were intended to serve the purpose of pictured story books at a time when illustration was confined principally to illuminated initials in manuscripts.
PopularScience_19290401_0114_004_0179.xml
article
73
73
Unusual Facts and Ideas
[no value]
Many Uses Combined in One Watering Can
[no value]
[no value]
[no value]
[no value]
A NOVEL watering can designed for half a dozen uses is now on the market. A spout at one side equips it to fill automobile radiators. A two-byeight-inch perforated mouth on the other side is a sprinkler for gardens and lawns. It helps in washing automobiles, too, the maker says, as it furnishes a steady, gentle shower without splashing.
PopularScience_19290401_0114_004_0180.xml
article
73
73
Unusual Facts and Ideas
[no value]
Treadmill Prancing Trains Postmen to Walk
[no value]
[no value]
[no value]
[no value]
TEACHING postmen how to walk may sound paradoxical, but teaching them to walk hygienically is a positive boon to them and to the public they serve, according to a Chicago foot specialist, Dr. J. C. Rintelen, who recently gave lessons to sixty letter carriers in Norfolk. Va.
PopularScience_19290401_0114_004_0181.xml
article
73
73
[no value]
[no value]
Jointed Handle Is Aid in Stamping
[no value]
[no value]
[no value]
[no value]
BY PROVIDING play between the handle and mounting, a rubber joint increases the ease with which a new stamp can be used. It allows the handle to be held at different angles without marring the impression. In the ordinary rubber stamp, with rigid handle, care must be exercised to keep the stamp horizontal or its impression will be blurred or incomplete.
PopularScience_19290401_0114_004_0182.xml
article
73
73
Unusual Facts and Ideas
[no value]
Canadians Will Use Peat To Reduce Coal Bills
[no value]
[no value]
[no value]
[no value]
PEAT fuel will be prepared for the markets of Ottawa and Montreal, Canada, in a government plant at Alfred, Ont., which is practically automatic. It will operate twenty-two hours a day and turn out 20,000 tons of peat “bricks” during the winter season of 100 days.
PopularScience_19290401_0114_004_0183.xml
article
73
73
Unusual Facts and Ideas
[no value]
Snake Bites Killed 27 in U. S. in a Year
[no value]
[no value]
[no value]
[no value]
TWENTY-SEVEN persons died of snake bite in the United States in 1928, according to R. H. Hutchinson and R. E. Stadelman, of the Antivenin Institute of America. Five hundred and seventy persons were victims of different varieties of poisonous serpents.
PopularScience_19290401_0114_004_0184.xml
article
74
74,75,172
LEADING ARTICLES
[no value]
Locking Out the Heat and Cold
A Home Builder Finds Improved Insulation Soon Pays for Itself in Comfort and Lower Fuel Bills
[no value]
[no value]
WILLIAM DEWEY FOSTER
WITHOUT comfort, no matter how economically it may be built or operated, a home becomes a mere shelter from the elements. In recent years, American builders have been striving more and more to make houses livable and healthy. And in accomplishing this they have found insulation to be one of their principal aids in barring out cold in winter and heat in summer.
PopularScience_19290401_0114_004_0185.xml
article
76
76
The New Household Inventions
[no value]
Nonskid Anchors for Rugs
[no value]
[no value]
[no value]
[no value]
Rugs can’t slide or pull under vacuum cleaners when the latest antiskid buttons anchor them in place. Half of a fastener is attached to the floor at each corner. The other half, sewed to the rug, is quickly snapped into it.
PopularScience_19290401_0114_004_0186.xml
article
76
76
The New Household Inventions
[no value]
Lastest Dishwasher Wheels to Table
[no value]
[no value]
[no value]
[no value]
Clamped to faucets with Y-shaped arms, this new washer cleans your dishes with water swirled around by an electric pump. By placing the washer on a rolling stand you can wheel your dishes to and fro. In addition to breaking up food particles to pass down the drain pipe, the washer’s electric motor will run a cream-whipper, an egg-beater, or a small drill used on household jobs. A rotating brush also will remove cooked food adhering to pots and pans.
PopularScience_19290401_0114_004_0187.xml
article
76
76
The New Household Inventions
[no value]
No Tears in Onion Chopping
[no value]
[no value]
[no value]
[no value]
You’ll shed no tears when you chop or slice onions with this glass-inclosed plunger. Put the vegetable on a wooden base, cover it, give the protruding handle a few strokes, and presto! the job is done “without a tear in an onion.”
PopularScience_19290401_0114_004_0188.xml
article
76
76
The New Household Inventions
[no value]
New Adjustable Can-Opener
[no value]
[no value]
[no value]
[no value]
Here’s a new improvement on an old household tool! An adjustable blade, held tight by a set screw, may be easily moved from place to place on this can opener to help you in cutting the covers of any tin containers.
PopularScience_19290401_0114_004_0189.xml
article
76
76
The New Household Inventions
[no value]
A New Automatic Toaster
[no value]
[no value]
[no value]
[no value]
A timing mechanism won’t let you burn bread in this new electric toaster. When the toast is just right the current snaps off and the two doors open to deliver two golden-brown slices.
PopularScience_19290401_0114_004_0190.xml
article
76
76
The New Household Inventions
[no value]
Combination Ice Pick and Bottle Opener
[no value]
[no value]
[no value]
[no value]
With this combined ice pick and bottle opener you can crack ice or uncork a bottle in a jiffy, thus saving time.
PopularScience_19290401_0114_004_0191.xml
article
77
77
Mechanical Novelties in Wide Variety Offer Greater Convenience and Economy in the Home
[no value]
Safety Lock for Gas Cocks
[no value]
[no value]
[no value]
[no value]
Insurance against accidentally opening the cocks of a gas range is provided by the simple lock-tight metal strip which P. Albanese, of Passaic, N. J., the inventor, is exhibiting. His device can be used on gas stoves with any number of burners.
PopularScience_19290401_0114_004_0192.xml
article
77
77
Mechanical Novelties in Wide Variety Offer Greater Convenience and Economy in the Home
[no value]
A Stand for Your Razor
[no value]
[no value]
[no value]
[no value]
Your safety razor will never be out of place if it is kept on this convenient little china stand, which has a compartment for new blades and a receptacle into which the discarded ones may be dropped.
PopularScience_19290401_0114_004_0193.xml
article
77
77
Mechanical Novelties in Wide Variety Offer Greater Convenience and Economy in the Home
[no value]
Bovel "Cooking Cabinet"
[no value]
[no value]
[no value]
[no value]
Here’s a genuine "cooking cabinet" for summer as well as winter use. Inch-thick insulation prevents its heat from warming the kitchen. When its cover is shut a small simmer burner will keep food warm for hours. An "elevator" saves stooping to lift a roast, as shown above.
PopularScience_19290401_0114_004_0194.xml
article
77
77
Mechanical Novelties in Wide Variety Offer Greater Convenience and Economy in the Home
[no value]
Wall Recess Guards Hot Iron
[no value]
[no value]
[no value]
[no value]
Protected from dust and rust, your electric iron is tucked away in this built-in wall closet, which also serves as a rest for the iron when in use. Asbestos lining and a ventilated door allow safe storage of iron while hot.
PopularScience_19290401_0114_004_0195.xml
article
77
77
Mechanical Novelties in Wide Variety Offer Greater Convenience and Economy in the Home
[no value]
Handy New Broom and Mop Holder
[no value]
[no value]
[no value]
[no value]
Brooms, mops, and household tools with handles can be conveniently kept in wall brackets like the one at the right. Curved nonskid holders grip the handles by spring tension as they are pushed into place. A lift removes the article when needed.
PopularScience_19290401_0114_004_0196.xml
article
77
77
Mechanical Novelties in Wide Variety Offer Greater Convenience and Economy in the Home
[no value]
Miniature Washboard for Dainties
[no value]
[no value]
[no value]
[no value]
For girls who prefer to launder their own fragile silk stockings and flimsy lingerie this little metal washboard is just the thing. Its curved handle fits the back of the Land that grips it, when placed in a basin, and its corrugations are declared to be harmless to delicate fabrics.
PopularScience_19290401_0114_004_0197.xml
article
78
78,119
Ideas for the Handy Man
[no value]
Sewing Table in Modern Style
Materials for Sewing Table
[no value]
[no value]
H. J. ROSKYL
WITH the exception of dressing tables, most small, individual pieces of modernistic furniture seem to have been designed mainly for masculine use and enjoyment. In the accompanying illustrations, however, is shown a piece of furniture in the modern taste designed exclusively for the use of the lady of the house.
PopularScience_19290401_0114_004_0198.xml
article
79
79,128
SPECIAL FEATURES
[no value]
Who Can Match This Shop?
A. J. Stuhler, Who Likes to Make Things at Home, Pursues His Hobby with an Assortment of 1,238 Individual Tools and Machines
[no value]
[no value]
[no value]
THAT kind of home workshop most of us have pictured only in our daydreaming A. J. Stuhler, of Monticello, Iowa, actually owns. Contained in two rooms, the shop includes 1,238 individual tools and machines. Each machine has an individual motor, and there are fourteen ¼-H.P., one 1/3-H.P., and one ½-H.P. motors.
PopularScience_19290401_0114_004_0199.xml
article
80
80,117
SPECIAL FEATURES
[no value]
Turning Fancy Boxes and Bowls
[no value]
[no value]
[no value]
HERMAN HJORTH
MAKING small boxes is one of the most interesting and fascinating types of work that can be done on a wood-turning lathe, for the possibilities in the choice of size and design are almost without limit. The cover of the powder box, Fig. 1, is turned from a piece of wood at least 1 in. more in diameter than the finished dimensions call for.
PopularScience_19290401_0114_004_0200.xml
article
81
81,126
Ideas for the Handy Man
[no value]
Hammering Out Metal Trays
You Will Be Surprised How Easy It Is to Make and Emboss Artistic Looking Receptacles for Ashes, Cards, or Pens
[no value]
[no value]
EDWARD THATCHER
SMALL card, ash, and pen trays (Fig. 2) are easy for the beginner in decorative metal working to make. They form useful and acceptable gifts and, when well shaped and neatly finished, can be sold at a profit if a local market can be found for them.
PopularScience_19290401_0114_004_0201.xml
article
82
82
SPECIAL FEATURES
[no value]
EDITORIALS
Protecting Yankee Ingenuity
Keeping a Step Ahead
Why Not Make Use of Them?
Something More to Worry About
They Are Saying—
[no value]
[no value]
[no value]
B. T. STEBER, of Utica, N. Y., in a letter to POPULAR SCIENCE MONTHLY, criticizes the conduct of the U. S. Patent Office. He charges that instead of serving as an incentive to invention, for which it was intended, the Patent Office stifles initiative by dilatory methods.
PopularScience_19290401_0114_004_0202.xml
advertisement
83
83
[no value]
[no value]
Advertisement
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[no value]
PopularScience_19290401_0114_004_0203.xml
article
84
84,174
SPECIAL FEATURES
[no value]
If Your Headlights Went Out
And You Were Speeding Forty Miles an Hour, What Would You Do? Gus Explains the First Rules for Safe Driving
[no value]
[no value]
MARTIN BUNN
WE’D better step on it, Gus; the wife’ll have the eats waiting by now," Joe Clark urged as he locked the door of the Model Garage and hastily climbed in beside his partner. "Huh!" snorted Gus Wilson. "You don’t have to tell a hungry old bachelor to hurry when there’s home-cooked fodder in sight!”
PopularScience_19290401_0114_004_0204.xml
advertisement
85
85
[no value]
[no value]
RCA RADIOTRON
[no value]
RCA RADIOTRON
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0205.xml
article
86
86,125
For the Home Owner
[no value]
More Closet Space
How to Gain Room for Storing Clothes Simply by Adding Shelves, Coat Rails, Hooks, Hangers, and Various Fixtures
[no value]
[no value]
L. M. ROEHL
YOU can put more of the closet space in your home to practical use by building in additional shelves, coat rails, and compartments and by adding hooks, rods, and hangers. Figure 1 shows a simple and practical way to place shelves at the back or end of a closet.
PopularScience_19290401_0114_004_0206.xml
advertisement
87
87
[no value]
[no value]
S. C. JOHNSON & SON: JOHNSON'S WOOD DYE
[no value]
S. C. JOHNSON & SON
JOHNSON'S WOOD DYE
[no value]
[no value]
PopularScience_19290401_0114_004_0207.xml
advertisement
88
88,89
[no value]
[no value]
Advertisement
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PopularScience_19290401_0114_004_0208.xml
article
90
90
Automobiles
[no value]
Fix It Yourself with These Handy Hints for Motorists
How to Keep Your Windshield Wiper Wor king, Build a Nest for Tools, Grind Valves an Easy Way, or Rig a Siphon
[no value]
[no value]
[no value]
THE average windshield wiper goes bad long before it is worn out. Constant contact with the surface of the glass puts a kink in the rubber edge so that it will not bend back and forth to clean the glass as it should. Fig 1, below, shows how to avoid this deterioration.
PopularScience_19290401_0114_004_0209.xml
article
90
90
Automobiles
[no value]
Convenient Tool Pockets
[no value]
[no value]
[no value]
[no value]
THE coach type of auto body usually has the front seats so they can tip forward to give access to the rear seats. Hinges support these seats at the front and feet are provided at the rear so that there is a space between the bottom of the seat and floor of the car.
PopularScience_19290401_0114_004_0210.xml
article
90
90
Automobiles
[no value]
Trick Valve-Grinding Tool
[no value]
[no value]
[no value]
[no value]
AN ORDINARY plumber’s force cup, such as is used for clearing clogged drain pipes, can be fashioned into a useful valve-grinding tool. The lower part of the rubber cup is cut off so that the diameter of the remaining portion is smaller than the diameter of the head of the valve.
PopularScience_19290401_0114_004_0211.xml
article
90
90
Automobiles
[no value]
Ten Dollars for an Idea!
[no value]
[no value]
[no value]
[no value]
R. L. Ogden, of Edgewater, Colo., wins this month’s $10 prize for his suggestion of a valve-grinding tool, as shown in Fig. 3. Each month POPULAR SCIENCE MONTHLY awards $10, in addition to regular space rates, for the best idea sent in for motorists.
PopularScience_19290401_0114_004_0212.xml
article
90
90
Automobiles
[no value]
A Self-Starting Siphon
[no value]
[no value]
[no value]
[no value]
INSTEAD of sucking rubber hose to start gasoline siphoning out of a tank, construct the neat siphon shown in Fig. 4. Bend a piece of brass or copper tubing into a U shape. To one end attach a rubber bulb like photographers use. To the other attach a piece of hose.
PopularScience_19290401_0114_004_0213.xml
article
90
90
Automobiles
[no value]
Running-Board Tire Rack
[no value]
[no value]
[no value]
[no value]
FIGURE 5 shows a convenient and simple running-board tire holder that can be made from a block of wood, some strap iron, and five bolts. As shown, the arrangement is for a rim fitted with four lugs, but it will work with other numbers of lugs, if necessary.
PopularScience_19290401_0114_004_0214.xml
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91
91
[no value]
[no value]
VACUUM OIL COMPANY
[no value]
VACUUM OIL COMPANY
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0215.xml
article
92
92,118
Photography
[no value]
Dressing Up Your Photographs
An Expert’s Method of Preparing Prints for Framing—How to Emboss the Mounts
How to Mount Photos
[no value]
[no value]
WALTER E. BURTON
HENRY, I wish you would take this photograph of Mary Ellen down town and have it framed," Mrs. Webster said to her husband as he started for the office. "I'll get a frame and put the picture in it myself. That will be cheaper," Henry replied. "Where's the yardstick?"
PopularScience_19290401_0114_004_0216.xml
advertisement
93
93
[no value]
[no value]
CLAYTON & LAMBERT MANUFACTURING CO.
[no value]
CLAYTON & LAMBERT MANUFACTURING CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0217.xml
article
94
94,130
Ideas for the Handy Man
[no value]
One Bench That’s Big Enough
Designed for Home Workshop Use, ItIs of Heavy-DutyType Yet Easy to Build
Materials for Bench
What Lumber to Order
Hardware
Sizes of Finished Pieces
[no value]
[no value]
E. E. ERICSON
EVERY amateur woodworker and every man who does much household repair work needs a fairly large, rigid workbench. Wherever there is room available—in the basement, garage, or large attic— the bench illustrated will make its appeal to the worker because of its strength, durability, and simplicity of design and construction.
PopularScience_19290401_0114_004_0218.xml
advertisement
95
95
[no value]
[no value]
Advertisements
[no value]
Henry Disston & Sons, Inc.
Back Saw
Henry Disston & Sons, Inc.
Dovetail Saw
[no value]
[no value]
PopularScience_19290401_0114_004_0219.xml
article
96
96,98
SPECIAL FEATURES
[no value]
A Light Hand on the Wrench
Often Prevents the Serious Distortion of Work Held in Lathes or Other Machines, According to HENRY SIMON, Expert on Better Shop Methods
[no value]
[no value]
[no value]
IF THERE are a dozen ways of distorting work held against the faceplate or machine table, there are at least as many of doing the same thing with the chuck. Every mechanic is familiar with the difficulties of holding a thin ring without causing it to go out of round, but it is not so generally realized how thick a ring or tubular part may be and yet be distorted by the pressure of chuck jaws under certain conditions.
PopularScience_19290401_0114_004_0220.xml
advertisement
97
97
[no value]
[no value]
L. S. STARRETT CO.
[no value]
L. S. STARRETT CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0221.xml
advertisement
99
99
[no value]
[no value]
BROWN & SHARPE TOOLS
[no value]
BROWN & SHARPE TOOLS
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0222.xml
advertisement
100
100,101
[no value]
[no value]
Eastman Kodak Company
[no value]
Eastman Kodak Company
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0223.xml
article
102
102
For the Home Owner
[no value]
Emptying a Washing Machine
[no value]
[no value]
[no value]
R. H. KASPER.
ALTHOUGH houses built today usually have a built-in drain in the basement or laundry, older houses frequently lack this convenience, and the laundress has to drain the washing machine into pails, which must be lifted to the laundry tubs or carried to a drain.
PopularScience_19290401_0114_004_0224.xml
article
102
102,131
For the Home Owner
[no value]
Controlling a Bathroom Light— And Hints for Home Owners
[no value]
[no value]
[no value]
[no value]
EASILY accessible to both little folks and adults is the bathroom light switch illustrated in Fig. 2. It is made by attaching a tape to the end of the chain of a chain type socket. The tape is run through a screw eye at the top (Continued on page 131)
PopularScience_19290401_0114_004_0225.xml
advertisement
102
102
[no value]
[no value]
DeWALT PRODUCTS CORPORATION
[no value]
DeWALT PRODUCTS CORPORATION
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0226.xml
advertisement
103
103
[no value]
[no value]
MILLERS FALLS CO.: Line
[no value]
MILLERS FALLS CO.
Line
[no value]
[no value]
PopularScience_19290401_0114_004_0227.xml
article
104
104
Ideas for the Handy Man
[no value]
Turning a Flag into an Egg
Is an Easy Trick with Which to Mystify Your Friends if You Know What Preparations to Make
[no value]
[no value]
GEORGE S. GREENE
IN THE flag and the egg trick, which is a most effective one for the amateur magician, a silk flag is stuffed into the cupped hands, yet when the hands are opened nothing is seen but an egg. To prepare for the trick, chip a hole the size of a quarter in the side of an egg with a knife and allow the contents to flow out.
PopularScience_19290401_0114_004_0228.xml
article
104
104
Photography
[no value]
Taking Pictures Backwards for Amateur Movies
[no value]
[no value]
[no value]
H. N. WHITMORE
TO GET reversed motion with an amateur movie camera, merely hold it upside down while taking the particular scene which you want to film backwards. When the roll is returned to you, separate the reversed scene and splice it in, turning it end for end so that it will run right side up in the projection machine.
PopularScience_19290401_0114_004_0229.xml
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104
104
[no value]
[no value]
LEWIS COPELAND COMPANY
[no value]
LEWIS COPELAND COMPANY
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0230.xml
advertisement
105
105
[no value]
[no value]
NATIONAL CARBON CO., INC.: EVEREADY RADIO SETS
[no value]
NATIONAL CARBON CO., INC.
EVEREADY RADIO SETS
[no value]
[no value]
PopularScience_19290401_0114_004_0231.xml
article
106
106,127
Ideas for the Handy Man
[no value]
Landing Gear for Model Planes
[no value]
[no value]
[no value]
VINCENT L. JOHNSTONE
IF YOU use the landing gear described iii this article with a model built according to the plans in the March issue for the world's record seaplane of Tudor Morris, you will find yourself in a good position to win prizes in any model airplane contest.
PopularScience_19290401_0114_004_0232.xml
advertisement
106
106
[no value]
[no value]
PLOMB TOOL COMPANY
[no value]
PLOMB TOOL COMPANY
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0233.xml
advertisement
107
107
[no value]
[no value]
Packard Electric Company: Modern H. C. Engines
[no value]
Packard Electric Company
Modern H. C. Engines
[no value]
[no value]
PopularScience_19290401_0114_004_0234.xml
article
108
108
Ideas for the Handy Man
[no value]
Blueprints for Your Home Workshop
[no value]
[no value]
[no value]
[no value]
OUR blueprints can be obtained for 25 cents a sheet. In some cases there are two or three sheets to one subject. The blueprints are complete in themselves, but if you wish the corresponding back issue of the magazine in which the project was described in detail, it can be bad for 25 cents additional so long as copies are available.
PopularScience_19290401_0114_004_0235.xml
advertisement
108
108
[no value]
[no value]
CHAMPION Spark Plugs
[no value]
CHAMPION Spark Plugs
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0236.xml
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108
108
[no value]
[no value]
Advertisement
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0237.xml
advertisement
109
109
[no value]
[no value]
Western Electric
[no value]
Western Electric
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0238.xml
article
110
110
Ideas for the Handy Man
[no value]
Metal Fastenings for Woodwork
[no value]
[no value]
[no value]
[no value]
HARDWOOD dowels may be used in different ways. For some purposes, like reinforcing a glued joint, there is no adequate substitute; but for other purposes there are metal pins and screws that are more efficient than the wood dowel. These may be bought in many ordinary hardware stores or ordered from the catalogue of a large hardware dealer.
PopularScience_19290401_0114_004_0239.xml
advertisement
110
110
[no value]
[no value]
BRUNNER MFG. CO.
[no value]
BRUNNER MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0240.xml
advertisement
110
110
[no value]
[no value]
AMERICAN SCREW CO.
[no value]
AMERICAN SCREW CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0241.xml
advertisement
111
111
[no value]
[no value]
J. D. Wallace & Company: WORKACE ELECTRIC WOODWORKER
[no value]
J. D. Wallace & Company
WORKACE ELECTRIC WOODWORKER
[no value]
[no value]
PopularScience_19290401_0114_004_0242.xml
article
112
112
Ideas for the Handy Man
[no value]
Turning Large Work on a Small Lathe
[no value]
[no value]
[no value]
[no value]
AS THE owner of one of the popular electric workshops with a capacity for turning wood about 9 in. in diameter, I was confronted with the problem of turning a piece to a diameter of 10½ in. I found that I could easily turn this piece or, indeed, one as large as 11 in.
PopularScience_19290401_0114_004_0243.xml
article
112
112
Ideas for the Handy Man
[no value]
Novel Way to Bend Bamboo for Model Airplanes
[no value]
[no value]
[no value]
[no value]
THAT readers in far corners of the world are building POPULAR SCIENCE MONTHLY airplane models is indicated by many letters which have been received, among them the following from J. P. Smith, of Christchurch, New Zealand: “Some of your readers, when making model airplanes such as the Bremen, may have experienced difficulty in bending bamboo in the exact place required by means of an ordinary candle flame.
PopularScience_19290401_0114_004_0244.xml
advertisement
112
112
[no value]
[no value]
SIMONDS SAW AND STEEL CO.: CIRCULAR SAWS
[no value]
SIMONDS SAW AND STEEL CO.
CIRCULAR SAWS
[no value]
[no value]
PopularScience_19290401_0114_004_0245.xml
advertisement
112
112
[no value]
[no value]
RUXTON MULTI-VIDER CORPORATION: RUXTON MULTI-VIDER Multiplies—Divides
[no value]
RUXTON MULTI-VIDER CORPORATION
RUXTON MULTI-VIDER Multiplies—Divides
[no value]
[no value]
PopularScience_19290401_0114_004_0246.xml
advertisement
113
113
[no value]
[no value]
Universal Aviation Corporation
[no value]
Universal Aviation Corporation
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0247.xml
article
114
114,120,121
Ideas for the Handy Man
[no value]
How to Display a Ship Model
If You Have Built Our Mississippi Steamboat, You Can Place It on Pedestals or in a Scenic Case
[no value]
[no value]
E. ARMITAGE McCANN,
MANY of the ship model builders who have been following our Mississippi steamboat articles now have their models of the Buckeye State completely finished. There remains but the problem of mounting and placing it—a problem of interest to all who make ship models.
PopularScience_19290401_0114_004_0248.xml
advertisement
114
114
[no value]
[no value]
GREENFIELD, MASS.: GOODELL PRATT
[no value]
GREENFIELD, MASS.
GOODELL PRATT
[no value]
[no value]
PopularScience_19290401_0114_004_0249.xml
article
115
115
For the Home Owner
[no value]
Home Workshop Chemistry
Simple Formulas that Will Save Time and Money
[no value]
[no value]
W. H. HAMMOND
MOST of us at some time or another have picked up bargains in "all wool" men’s suits or other garments at absurdly low prices. Later we have sometimes realized that the money had been thrown away through our inability to distinguish between the common textile fibers.
PopularScience_19290401_0114_004_0250.xml
advertisement
115
115
[no value]
[no value]
NORTH BROS. MFG. CO.: "YANKEE" TOOLS
[no value]
NORTH BROS. MFG. CO.
"YANKEE" TOOLS
[no value]
[no value]
PopularScience_19290401_0114_004_0251.xml
article
116
116
Ideas for the Handy Man
[no value]
Mixing a Low-Cost Varnish Remover
[no value]
[no value]
[no value]
R. C. STANLEY
IN THE first of my series of articles on repairing antique furniture, which began in the December, 1927, issue, I gave a formula for making varnish remover. Since that time I have done some experimenting and wish to give readers the benefit of the results in the form of a recipe which modifies the previous one and reduces the cost considerably.
PopularScience_19290401_0114_004_0252.xml
advertisement
116
116
[no value]
[no value]
The Peck, Stow & Wilcox Co.
[no value]
The Peck, Stow & Wilcox Co.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0253.xml
advertisement
116
116
[no value]
[no value]
Rutland Fire Clay Co.: Rutland Patching Plaster
[no value]
Rutland Fire Clay Co.
Rutland Patching Plaster
[no value]
[no value]
PopularScience_19290401_0114_004_0254.xml
advertisement
116
116
[no value]
[no value]
THE PORTER-CABLE MACHINE COMPANY
[no value]
THE PORTER-CABLE MACHINE COMPANY
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0255.xml
advertisement
117
117
[no value]
[no value]
Palmolive
[no value]
Palmolive
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0256.xml
advertisement
118
118
[no value]
[no value]
THE ELECTRIC SPRAYIT CO.,Inc.: SPRAYIT
[no value]
THE ELECTRIC SPRAYIT CO.,Inc.
SPRAYIT
[no value]
[no value]
PopularScience_19290401_0114_004_0257.xml
advertisement
118
118
[no value]
[no value]
Larus & Brother Company
[no value]
Larus & Brother Company
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0258.xml
advertisement
119
119
[no value]
[no value]
STUDEBAKER CORPORATION
[no value]
STUDEBAKER CORPORATION
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0259.xml
advertisement
120
120
[no value]
[no value]
JOHNSON MOTOR COMPANY
[no value]
JOHNSON MOTOR COMPANY
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0260.xml
advertisement
120
120
[no value]
[no value]
The Parks Woodworking Machine Co.
[no value]
The Parks Woodworking Machine Co.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0261.xml
advertisement
120
120
[no value]
[no value]
THE WILBAR CO., Inc.: SAW OUTFIT
[no value]
THE WILBAR CO., Inc.
SAW OUTFIT
[no value]
[no value]
PopularScience_19290401_0114_004_0262.xml
advertisement
120
120
[no value]
[no value]
W.B. & J.E. Boice
[no value]
W.B. & J.E. Boice
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0263.xml
article
121
121
Ideas for the Handy Man
[no value]
Small Baltimore Clipper Model Is Easy to Make
[no value]
[no value]
[no value]
[no value]
SIMPLEST of all POPULAR SCIENCE MONTHLY ship models to make is the rakish little Baltimore clipper illustrated above. The hull is in. long and the entire model, including the base, is only 8 in., yet it makes a striking ornament on any desk, table, or mantelshelf.
PopularScience_19290401_0114_004_0264.xml
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121
121
[no value]
[no value]
The Mennen Company: MENTHOL-ICED SHAVING CREAM
[no value]
The Mennen Company
MENTHOL-ICED SHAVING CREAM
[no value]
[no value]
PopularScience_19290401_0114_004_0265.xml
article
122
122,123,124
For the Home Owner
[no value]
How to Do Decorating with Paint Spray Guns
[no value]
[no value]
[no value]
F. N. VANDERWALKER
MANY handy men and amateur painters and decorators are asking just how much of the painting and decorating about the house and workshop can be done with spray guns of the hand pump, foot pump, or small-motor-operated types. They wish to know also what methods are required and if really first-class finishing can be done with this new tool.
PopularScience_19290401_0114_004_0266.xml
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122
122
[no value]
[no value]
Motor Improvements, Inc.: PUROLATOR THE OIL FILTER
[no value]
Motor Improvements, Inc.
PUROLATOR THE OIL FILTER
[no value]
[no value]
PopularScience_19290401_0114_004_0267.xml
advertisement
123
123
[no value]
[no value]
MOTOR IMPROVEMENTS, INC.: PUROLATOR
[no value]
MOTOR IMPROVEMENTS, INC.
PUROLATOR
[no value]
[no value]
PopularScience_19290401_0114_004_0268.xml
article
124
124
Ideas for the Handy Man
[no value]
Paraffin Seals Paint Cans
[no value]
[no value]
[no value]
JOHN R. DODGE
PAINT, putty, furnace cement, and similar materials cannot be kept in open cans without hardening on the surface or deteriorating. To preserve them from one job to another, I protect them from the air with a layer of paraffin wax. In the case of ordinary paint, I place the can or bucket on a piece of newspaper, mark around it with pencil, and cut out a circle of paper, which is then placed on top of the paint to keep the hot paraffin from running into the paint.
PopularScience_19290401_0114_004_0269.xml
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124
124
[no value]
[no value]
COLGATE
[no value]
COLGATE
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0270.xml
article
125
125
Ideas for the Handy Man
[no value]
You Must “Strike Gold” to Win This Game
[no value]
[no value]
[no value]
[no value]
IN THIS new game of prospector’s luck, the player puts the ball on the upper platform, spins the pan with one finger at a moderate speed, and pushes the ball into the chute. If the ball falls into the space marked “gold,” it is a “strike,” and the player retires from the game a winner.
PopularScience_19290401_0114_004_0271.xml
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125
125
[no value]
[no value]
Willims Oil-O-Matic Heating Corporation
[no value]
Willims Oil-O-Matic Heating Corporation
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0272.xml
advertisement
126
126
[no value]
[no value]
J. H. WILLIAMS & CO.
[no value]
J. H. WILLIAMS & CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0273.xml
advertisement
126
126
[no value]
[no value]
FOLEY SAW TOOL CO.
[no value]
FOLEY SAW TOOL CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0274.xml
advertisement
126
126
[no value]
[no value]
International Mill and Timber CO.
[no value]
International Mill and Timber CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0275.xml
advertisement
126
126
[no value]
[no value]
Mead Cycle Company
[no value]
Mead Cycle Company
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0276.xml
article
127
127
Photography
[no value]
Titles for Amateur Movies
[no value]
[no value]
[no value]
[no value]
IN MAKING titles with amateur or 16 mm. moving picture film, use 2 ft. of film for every four words if the title exceeds eight words. For a title of less than eight words, use 2 ft. of film for every three words. It is not good practice to use less than 2 ft. for any title.
PopularScience_19290401_0114_004_0277.xml
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127
127
[no value]
[no value]
Upson Company
[no value]
Upson Company
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0278.xml
article
128
128
Ideas for the Handy Man
[no value]
Small Crucible Made from a Battery Carbon
[no value]
[no value]
[no value]
[no value]
WHEN the amateur mechanic wishes to make small castings of brass, aluminum, and various alloys, he can make a crucible from an old dry cell battery carbon. Take out the carbon, secure it firmly, and drill as large a hole as practical — ordinarily ½ or ⅝ in.
PopularScience_19290401_0114_004_0279.xml
article
128
128
Ideas for the Handy Man
[no value]
Inner Tube Makes a Punching Bag
[no value]
[no value]
[no value]
[no value]
A PUNCHING bag to amuse the children can be made by inclosing an old inner tube in a sack. The tube should be doubled in such a way that the valve is folded in toward the center of the punching bag. An old pair of gloves should be used to protect the children’s hands from ABRASIONS.
PopularScience_19290401_0114_004_0280.xml
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128
128
[no value]
[no value]
PRENTISS VISE CO.: Cheney nailer
[no value]
PRENTISS VISE CO.
Cheney nailer
[no value]
[no value]
PopularScience_19290401_0114_004_0281.xml
advertisement
128
128
[no value]
[no value]
REMINGTON ARMS COMPANY,Inc.: Radio Knife
[no value]
REMINGTON ARMS COMPANY,Inc.
Radio Knife
[no value]
[no value]
PopularScience_19290401_0114_004_0282.xml
advertisement
128
128
[no value]
[no value]
C. G. CONN
[no value]
C. G. CONN
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0283.xml
advertisement
129
129
[no value]
[no value]
DELTA SPECIALTY CO.
[no value]
DELTA SPECIALTY CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0284.xml
advertisement
130
130
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0285.xml
advertisement
131
131
[no value]
[no value]
NICHOLSON FILE COMPANY
[no value]
NICHOLSON FILE COMPANY
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0286.xml
article
132
132
[no value]
[no value]
Paper Bird Flaps Wings When Tail Is Pulled
[no value]
[no value]
[no value]
JEANNE I. ORSINI
BY FOLDING a single sheet of paper as shown, you can make a bird which will flap its wings when its tail is pulled. Different wings, bodies, heads, and tails can be pasted on the elementary form. Butterflies can be made similarly, and it is also possible to construct animals with ears that flap.
PopularScience_19290401_0114_004_0287.xml
article
132
132
[no value]
[no value]
Winding Cord in a Ball
[no value]
[no value]
[no value]
ROGER SLOAT
WHEN winding clothesline or other heavy cord into a ball, all kinking can be avoided if the ball is changed at intervals from the right to the left hand and vice versa. Wind with one hand until the cord begins to twist; then transfer the ball to the other hand without turning it around or changing the direction of winding.
PopularScience_19290401_0114_004_0288.xml
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132
132
[no value]
[no value]
Advertisement
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0289.xml
advertisement
132
132
[no value]
[no value]
Procter & Gamble
[no value]
Procter & Gamble
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0290.xml
advertisement
132
132
[no value]
[no value]
AERO MODEL CO.: Silver Ace Flying
[no value]
AERO MODEL CO.
Silver Ace Flying
[no value]
[no value]
PopularScience_19290401_0114_004_0291.xml
advertisement
133
133
[no value]
[no value]
BOSTON VARNISH COMPANY
[no value]
BOSTON VARNISH COMPANY
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0292.xml
advertisement
134
134
[no value]
[no value]
THE BRIDGEPORT HARDWARE MFO. CORP.
[no value]
THE BRIDGEPORT HARDWARE MFO. CORP.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0293.xml
advertisement
134
134
[no value]
[no value]
Smith Typewriter Sale. Corp.: GENUINE CORONA
[no value]
Smith Typewriter Sale. Corp.
GENUINE CORONA
[no value]
[no value]
PopularScience_19290401_0114_004_0294.xml
advertisement
134
134
[no value]
[no value]
C. G. CONN
[no value]
C. G. CONN
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0295.xml
advertisement
135
135
[no value]
[no value]
E. C. ATKINS & CO.: ATKINS SIVER STEEL SAWS
[no value]
E. C. ATKINS & CO.
ATKINS SIVER STEEL SAWS
[no value]
[no value]
PopularScience_19290401_0114_004_0296.xml
advertisement
136
136
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0297.xml
advertisement
137
137
[no value]
[no value]
South Bend Lathe Works
[no value]
South Bend Lathe Works
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0298.xml
advertisement
137
137
[no value]
[no value]
Crescent Tool Co.
[no value]
Crescent Tool Co.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0299.xml
advertisement
137
137
[no value]
[no value]
H.GERSTNER & SONS
[no value]
H.GERSTNER & SONS
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0300.xml
advertisement
137
137
[no value]
[no value]
UNITED ELECTRIC MOTOR CO.: ELECTRIC MOTOR ATTACHMENT
[no value]
UNITED ELECTRIC MOTOR CO.
ELECTRIC MOTOR ATTACHMENT
[no value]
[no value]
PopularScience_19290401_0114_004_0301.xml
advertisement
138
138
[no value]
[no value]
ADDISON-LESLIE COMPANY: PLASTIC WOOD
[no value]
ADDISON-LESLIE COMPANY
PLASTIC WOOD
[no value]
[no value]
PopularScience_19290401_0114_004_0302.xml
advertisement
138
138
[no value]
[no value]
C. J. Lundstrom Mfg. Co.: Bookcase
[no value]
C. J. Lundstrom Mfg. Co.
Bookcase
[no value]
[no value]
PopularScience_19290401_0114_004_0303.xml
advertisement
138
138
[no value]
[no value]
EVINRUDE MOTOR Co.
[no value]
EVINRUDE MOTOR Co.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0304.xml
advertisement
139
139
[no value]
[no value]
H. K. Porter, Inc.: Shear Cutter
[no value]
H. K. Porter, Inc.
Shear Cutter
[no value]
[no value]
PopularScience_19290401_0114_004_0305.xml
advertisement
139
139
[no value]
[no value]
SHAW MFG. CO.: Farm Tractor
[no value]
SHAW MFG. CO.
Farm Tractor
[no value]
[no value]
PopularScience_19290401_0114_004_0306.xml
advertisement
139
139
[no value]
[no value]
HOBART BROS. CO.
[no value]
HOBART BROS. CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0307.xml
advertisement
139
139
[no value]
[no value]
McLAIN ORTHOPEDIC SANITARIUM: KEY RING KNIFE
[no value]
McLAIN ORTHOPEDIC SANITARIUM
KEY RING KNIFE
[no value]
[no value]
PopularScience_19290401_0114_004_0308.xml
advertisement
140
140
[no value]
[no value]
MIDLAND APPLIANCE CORPORATION
[no value]
MIDLAND APPLIANCE CORPORATION
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0309.xml
advertisement
140
140
[no value]
[no value]
SKILSAW INC: JUNIOR SKILSAW
[no value]
SKILSAW INC
JUNIOR SKILSAW
[no value]
[no value]
PopularScience_19290401_0114_004_0310.xml
advertisement
140
140
[no value]
[no value]
Advertisement
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0311.xml
advertisement
140
140
[no value]
[no value]
Old Town Canoe Co.
[no value]
Old Town Canoe Co.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0312.xml
advertisement
141
141
[no value]
[no value]
Greenfield Tap & Die Corp.
[no value]
Greenfield Tap & Die Corp.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0313.xml
advertisement
141
141
[no value]
[no value]
AMERICAN CHIME CLOCK COMPANY
[no value]
AMERICAN CHIME CLOCK COMPANY
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0314.xml
advertisement
141
141
[no value]
[no value]
WM. F. NYE, Inc.
[no value]
WM. F. NYE, Inc.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0315.xml
advertisement
142
142
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0316.xml
article
143
143,144
[no value]
[no value]
Here Are Correct Answers to Questions on Page 60
[no value]
[no value]
[no value]
[no value]
1. Broadly speaking, chemistry deals with what things are made of, while physics deals with the properties or qualities things possess without regard to chemical composition. But there are many scientific problems which involve both chemistry and physics, so there is no sharp dividing line between the two sciences.
PopularScience_19290401_0114_004_0317.xml
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143
143
[no value]
[no value]
Billings & Spencer Company: Valve-and-Cotter-Pin Tool
[no value]
Billings & Spencer Company
Valve-and-Cotter-Pin Tool
[no value]
[no value]
PopularScience_19290401_0114_004_0318.xml
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143
143
[no value]
[no value]
AR-CON TOOL COMPANY
[no value]
AR-CON TOOL COMPANY
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0319.xml
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143
143
[no value]
[no value]
Mitchell Moulding Co.
[no value]
Mitchell Moulding Co.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0320.xml
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144
144
[no value]
[no value]
CeCo Mfg. Co.,Inc.: CC Radio Tubes
[no value]
CeCo Mfg. Co.,Inc.
CC Radio Tubes
[no value]
[no value]
PopularScience_19290401_0114_004_0321.xml
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144
144
[no value]
[no value]
GEO. W. WALKER COMPANY
[no value]
GEO. W. WALKER COMPANY
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0322.xml
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144
144
[no value]
[no value]
Carter Radio Co.
[no value]
Carter Radio Co.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0323.xml
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144
144
[no value]
[no value]
CHICAGO STOCK GEAR WORKS
[no value]
CHICAGO STOCK GEAR WORKS
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0324.xml
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145
145
[no value]
[no value]
Day-Fan Electric Co.: Electric Radio
[no value]
Day-Fan Electric Co.
Electric Radio
[no value]
[no value]
PopularScience_19290401_0114_004_0325.xml
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146
146
[no value]
[no value]
THORDARSON ELECTRIC MFG. CO.: Federal Radio
[no value]
THORDARSON ELECTRIC MFG. CO.
Federal Radio
[no value]
[no value]
PopularScience_19290401_0114_004_0326.xml
advertisement
146
146
[no value]
[no value]
IDEAL AEROPLANE & SUPPLY CO.
[no value]
IDEAL AEROPLANE & SUPPLY CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0327.xml
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146
146
[no value]
[no value]
Advertisements
[no value]
LOFTIS BROS & CO.
Ladies' Wrist Watch
LOFTIS BROS & CO.
Diamond Wedding Rings
[no value]
[no value]
PopularScience_19290401_0114_004_0328.xml
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147
147
[no value]
[no value]
EDWIN CIGAR CO.
[no value]
EDWIN CIGAR CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0329.xml
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147
147
[no value]
[no value]
AMPERITE: SELF-ADJUSTING Rheostat
[no value]
AMPERITE
SELF-ADJUSTING Rheostat
[no value]
[no value]
PopularScience_19290401_0114_004_0330.xml
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147
147
[no value]
[no value]
Russell Importing Co.: Men's Wrist Watch
[no value]
Russell Importing Co.
Men's Wrist Watch
[no value]
[no value]
PopularScience_19290401_0114_004_0331.xml
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147
147
[no value]
[no value]
Advertisements
[no value]
RAYTHEON MFG. CO.
Raytheon Kino-Lamp
RAYTHEON MFG. CO.
Raytheon Foto-Cell
[no value]
[no value]
PopularScience_19290401_0114_004_0332.xml
advertisement
148
148
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0333.xml
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149
149
[no value]
[no value]
BURGESS BATTERY COMPANY: SNAP LITE FLASHLIGHT
[no value]
BURGESS BATTERY COMPANY
SNAP LITE FLASHLIGHT
[no value]
[no value]
PopularScience_19290401_0114_004_0334.xml
advertisement
149
149
[no value]
[no value]
Advertisement
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0335.xml
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149
149
[no value]
[no value]
SMOOTH-ON MFG. CO.
[no value]
SMOOTH-ON MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0336.xml
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150
150,152,154
[no value]
[no value]
Money Making Opportunities for Readers of Popular Science Monthly
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0337.xml
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151
151
[no value]
[no value]
COYNE ELECTRICAL SCHOOL
[no value]
COYNE ELECTRICAL SCHOOL
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0338.xml
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153
153
[no value]
[no value]
Advertisement
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0339.xml
advertisement
155
155
[no value]
[no value]
Advertisement
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0340.xml
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156
156
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0341.xml
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157
157
[no value]
[no value]
Federal School of Commercial Designing
[no value]
Federal School of Commercial Designing
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0342.xml
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158
158
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0343.xml
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159
159
[no value]
[no value]
ENGINEER DOBE
[no value]
ENGINEER DOBE
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0344.xml
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159
159
[no value]
[no value]
FRANKLIN INSTITUTE
[no value]
FRANKLIN INSTITUTE
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0345.xml
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160
160
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0346.xml
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161
161
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0347.xml
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162
162
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0348.xml
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163
163
[no value]
[no value]
CLARENCE A. O'BRIEN
[no value]
CLARENCE A. O'BRIEN
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0349.xml
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164
164
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0350.xml
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165
165
[no value]
[no value]
VICTOR J. EVANS & CO.
[no value]
VICTOR J. EVANS & CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0351.xml
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166
166
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0352.xml
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167
167
[no value]
[no value]
MUNN & CO
[no value]
MUNN & CO
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0353.xml
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167
167
[no value]
[no value]
Masterlite Mfg. Co.
[no value]
Masterlite Mfg. Co.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0354.xml
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167
167
[no value]
[no value]
Standard Business Training Institute
[no value]
Standard Business Training Institute
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0355.xml
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167
167
[no value]
[no value]
RANDOLPH & CO.
[no value]
RANDOLPH & CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0356.xml
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168
168
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0357.xml
advertisement
169
169
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0358.xml
advertisement
170
170
[no value]
[no value]
Advertisement
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0359.xml
advertisement
171
171
[no value]
[no value]
McGraw-Hill Book Co.
[no value]
McGraw-Hill Book Co.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0360.xml
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171
171
[no value]
[no value]
Utilities Engineering Institute
[no value]
Utilities Engineering Institute
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0361.xml
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171
171
[no value]
[no value]
Rhodes Mfg. Co.
[no value]
Rhodes Mfg. Co.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0362.xml
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172
172
[no value]
[no value]
J. B. WILLIAMS COMPANY: Williams Shaving Cream
[no value]
J. B. WILLIAMS COMPANY
Williams Shaving Cream
[no value]
[no value]
PopularScience_19290401_0114_004_0363.xml
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173
173
[no value]
[no value]
Advertisement: POPULAR SCIENCE MONTHLY
[no value]
[no value]
POPULAR SCIENCE MONTHLY
[no value]
[no value]
PopularScience_19290401_0114_004_0364.xml
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174
174
[no value]
[no value]
HARLEY-DAVIDSON MOTOR CO.
[no value]
HARLEY-DAVIDSON MOTOR CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0365.xml
advertisement
175
175
[no value]
[no value]
International
[no value]
International
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0366.xml
advertisement
176
176
[no value]
[no value]
R. R. DONNELLEY & SONS CO.
[no value]
R. R. DONNELLEY & SONS CO.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0367.xml
advertisement
177
177
[no value]
[no value]
NATIONAL CARBON COMPANY, INC.: Eveready
[no value]
NATIONAL CARBON COMPANY, INC.
Eveready
[no value]
[no value]
PopularScience_19290401_0114_004_0368.xml
advertisement
178
178,179,180
[no value]
[no value]
American Tobacco Co.
[no value]
American Tobacco Co.
[no value]
[no value]
[no value]
PopularScience_19290401_0114_004_0369.xml