Issue: 19210801

Monday, August 1, 1921
August 1921
2
True
99
Tuesday, December 30, 2014

Articles
advertisement
3
3
[no value]
[no value]
THE OLIVER TYPEWRITER COMPANY: Oliver Nine
[no value]
THE OLIVER TYPEWRITER COMPANY
Oliver Nine
[no value]
[no value]
PopularScience_19210801_0099_002_0001.xml
advertisement
4
4
[no value]
[no value]
Chicago Technical College
[no value]
Chicago Technical College
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0002.xml
tableOfContents
4
4,6
[no value]
[no value]
CONTENTS
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0003.xml
advertisement
5
5
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0004.xml
advertisement
6
6
[no value]
[no value]
INTERNATIONAL CORRESPONDENCE SCHOOLS
[no value]
INTERNATIONAL CORRESPONDENCE SCHOOLS
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0005.xml
advertisement
6
6
[no value]
[no value]
UNIVERSITY OF APPLIED SCIENCE
[no value]
UNIVERSITY OF APPLIED SCIENCE
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0006.xml
advertisement
7
7
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0007.xml
advertisement
8
8,9,10,11,12,13
[no value]
[no value]
QUICK-ACTION ADVERTISING
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0008.xml
advertisement
14
14
[no value]
[no value]
U. S. SHIPPING BOARD EMERGENCY FLEET CORPORATION
[no value]
U. S. SHIPPING BOARD EMERGENCY FLEET CORPORATION
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0009.xml
article
15
15,16,17
[no value]
[no value]
Complete House Delivered by Truck for $1500
A project to break the housing deadlock
Relief at Hand?
Our Ancient Methods
What You Can Get for $1500
The Second Story Is Delivered First!
Where the Beds Go in the Daytime
Facts about the Unit House
Saved—$4200 on One House Alone
[no value]
[no value]
Simon Lake
ARE you to-day, like millions of other Americans, longing for a home of your own? Are prohibitive building costs keeping you a slave to your landlord and to an excessive monthly rent? Approximately 7,000,000 families in this country own their own homes.
PopularScience_19210801_0099_002_0010.xml
article
18
18
SHIPS AND SHIPBUILDING
[no value]
Sixty Miles an Hour in a “Wind-Boat”
[no value]
[no value]
[no value]
[no value]
THE idea of driving a boat with an air-propeller is not new by any means, but this particular boat illustrated below has many original features that make it stand out from any of the other boats that have been developed along these lines. The weight of the upper works is supported by two special metal pontoons.
PopularScience_19210801_0099_002_0011.xml
article
18
18
[no value]
[no value]
Spring-Cleaning a Skyscraper
[no value]
[no value]
[no value]
[no value]
FIFTEEN years ago the creamy white terra-cotta walls of the lofty Times Building in New York city were new and clean. Gradually they became gray and dull, and in the spring of this year it was decided to have them cleaned at a cost of about six thousand dollars.
PopularScience_19210801_0099_002_0012.xml
article
18
18
[no value]
[no value]
Stenches to Warn Miners of Danger
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0013.xml
article
19
19
[no value]
[no value]
Harness the Streams and Make Them Do the Work
[no value]
[no value]
[no value]
[no value]
DOES a stream flow through the corner of your farm? If so, get busy at once and put it in harness, for it represents horsepower going to waste. Its energy, created by the same force of gravity that moves the current, will provide electric lights, or it will furnish the electricity for storage batteries; or it will pump water into irrigation ditches.
PopularScience_19210801_0099_002_0014.xml
article
19
19
RADIO
[no value]
Filtering Noises Out of Radio
It is done by the use of static eliminators
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0015.xml
article
20
20,21
[no value]
[no value]
How the German Cables Were Diverted
A war measure establishes a scientific fact
The Task Was Begun in 1915
How the Cable Was Located
[no value]
[no value]
P. J. Risdon
SHORTLY after the declaration of war, all German telegraph cables were cut. Mr. C. H. Gray conceived the idea of utilizing these cables, and, on behalf of the French government, undertook the operation of converting them. The success of the operations was of immense importance, proving that the recovery in good condition and relaying of deep-sea cables is practicable.
PopularScience_19210801_0099_002_0016.xml
article
22
22
[no value]
[no value]
Protect Young Chicks from Rats
[no value]
[no value]
[no value]
[no value]
THE telescoping metal chicken-coop and wire feedingpen shown below were devised to keep out rats and other enemies. While the coop and feeder are separate units, they may be connected to provide a runway six feet long. The coop is made of galvanized iron and looks like a small traveling-bag.
PopularScience_19210801_0099_002_0017.xml
article
22
22
MEDICINE AND SURGERY
[no value]
You Can Watch Yourself Talk
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0018.xml
article
22
22
[no value]
[no value]
The Sun Does the Family Cooking
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0019.xml
article
23
23
MEDICINE AND SURGERY
[no value]
How X-Rays Make Life Safe for the Bomb Squad
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0020.xml
article
23
23
SHIPS AND SHIPBUILDING
[no value]
Raising Wrecked Ships on Cushions of Air
[no value]
[no value]
[no value]
[no value]
NEARLY two years ago the government dredge Florida was caught in a storm off Anastasia island near St. Augustine, Florida, and wrecked, the master and several of the crew losing their lives. Shortly afterward the U. S. S. Isis, in the service of the Geodetic Survey, was sent to the scene to chart the wreck as a protection to coastwise navigators.
PopularScience_19210801_0099_002_0021.xml
article
24
24
SPORTS AND PASTIMES
[no value]
She Carries a Complete Theater in an Ordinary-Sized Suitcase
[no value]
[no value]
[no value]
[no value]
A MINIATURE theater, which is carried from place to place in a suitcase, together with its properties and hand-painted paper stage folk, is being used by Miss Stella Boothe, a specialist in child hygiene, to convey to children the idea that good habits lead to health and happiness.
PopularScience_19210801_0099_002_0022.xml
article
24
24
[no value]
[no value]
The Problem of Fooling the Cream Thief
[no value]
[no value]
[no value]
[no value]
PERFECTLY honest forty per cent cream leaves an up-state creamery in a can addressed to a New York hotel. When it arrives, the butter-fat content may have shrunk to twenty per cent or less. Somewhere along the line the can has been opened, the cream stolen for sale, and the shortage made up with milk.
PopularScience_19210801_0099_002_0023.xml
article
25
25
[no value]
[no value]
Cities Marked in Light to Guide Airmen
[no value]
[no value]
[no value]
[no value]
IF the plans of the recent International Air Convention are ratified by the government, the near future will see every city of any size in the United States blazing at night with a number that will enable airmen to tell exactly where they are.
PopularScience_19210801_0099_002_0024.xml
article
25
25
SPORTS AND PASTIMES
[no value]
Fishing for Birds on the Island of St. Kilda
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0025.xml
article
26
26
[no value]
[no value]
The Braggs’ Apparatus for Studying Crystals
[no value]
[no value]
[no value]
[no value]
A tiny beam of X-rays is passed through a crystal of salt and then strikes an “ionization chamber” connected with a strip of goldleaf in an electroscope, which moves over a graduated scale and measures the amount of electrical energy that is left in the X-ray after passing through the crystal at different angles.
PopularScience_19210801_0099_002_0026.xml
article
27
27
MISCELLANY
[no value]
How an Ounce of Iron Might Blow Up a City
If man could release the powerful force that holds atoms together the world’s power problems would be solved
Radium Sets Scientists Guessing
Will the Atom Explode?
[no value]
[no value]
[no value]
SCIENTISTS today are probing the secrets of an explosive power capable of blowing the universe to pieces. When Sir Oliver Lodge startled the world with his declaration that an ounce of ordinary matter contained sufficient energy to lift a whole fleet of battleships from the water, he was not talking pure theory.
PopularScience_19210801_0099_002_0027.xml
article
28
28,29
NATURAL SCIENCE
[no value]
What Makes Water “Taste”?
Microscopic creatures that pollute water supplies
What Protozoa Are Like
How Protozoa Are Killed
Details of Necessary Study
[no value]
[no value]
Leon Augustus Hausman
DURING the months of spring and early summer there frequently develop, in reservoirs, a host of minute creatures that impart to drinking waters various “fishy” and other disagreeable odors and tastes. It is commonly supposed that such odors and tastes are due to the decomposition of fish or other animal or plant forms in the central reservoirs.
PopularScience_19210801_0099_002_0028.xml
article
29
29
SHIPS AND SHIPBUILDING
[no value]
The First Periscope Stowaway
[no value]
[no value]
[no value]
[no value]
ON the Princess Matoika, coming from Antwerp to New York, one of the officers noticed a pipe sticking out of a pile of coal. He ordered an investigation, and the coal was cleared away. As the coal-pile decreased, the pipe was found to lead to a box. To the amazement of everybody, a stowaway was discovered hiding inside.
PopularScience_19210801_0099_002_0029.xml
article
29
29
[no value]
[no value]
Canada’s Activity in Aeronautics
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0030.xml
article
30
30
[no value]
[no value]
Creating Steam by Electricity
Though the electric boiler has been perfected for industrial use, it is practicable only where the cost of fuel is exceptionally high
What is an Electric Boiler?
Steam-Storage Boilers Are New
[no value]
[no value]
Raymond Francis Yates
IF we had a heavy electric current at our disposal and caused it to pass through a container of water, the temperature of the water would be raised to the boiling-point. The current would be led in and out of the water with two carbon electrodes.
PopularScience_19210801_0099_002_0031.xml
article
31
31
[no value]
[no value]
The New Boiler in which Steam Is Generated by Electricity
[no value]
[no value]
[no value]
[no value]
This shows how the electric boiler is used to supply steam for manufacturing-process purposes. When the machinery of the plant is idle during the night, the water turbine drives an electric generator that supplies current to the electric boiler.
PopularScience_19210801_0099_002_0032.xml
article
32
32
[no value]
[no value]
Slot-Machines Deliver Your Food
[no value]
[no value]
[no value]
[no value]
DROP a nickel in the slot, and the glass door opens in front of the piece of pie you covet—such is the system in the wait-on-yourself restaurants that grow more popular every day. There are little glass doors in all four walls of the restaurant, and behind them are plates of food.
PopularScience_19210801_0099_002_0033.xml
article
32
32
MISCELLANY
[no value]
Electrifying Water to Give It Sparkle
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0034.xml
article
32
32
MEDICINE AND SURGERY
[no value]
Wear Lead to Avoid Radium Dangers
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0035.xml
article
33
33,34
MISCELLANY
[no value]
Will a Ten-Mile Dam Change Canada’s Climate?
Plugging Belle Isle strait might warm New England also
Would Shorten Trip to Europe
The Warm Gulf Stream
Will the Ocean Obey?
Changes that Would Arise
[no value]
[no value]
Walter Noble Burns
THE strait of Belle Isle, a narrow channel separating Newfoundland from Labrador, is a hole in the wall of the Atlantic seaboard that is mainly responsible for the bleak winter climate of eastern Canada. Plug this hole, scientists declare, and eastern Canada and New England would have a climate as mild and delightful as that of the Carolinas.
PopularScience_19210801_0099_002_0036.xml
article
34
34
MEDICINE AND SURGERY
[no value]
Where We Injure Ourselves Most
[no value]
[no value]
[no value]
[no value]
THIS drawing shows the results obtained by a careful analysis of more than eighteen thousand injuries. It shows at a glance where we injure ourselves most. The hands and fingers are injured most! and this is natural, since we use our hands more than any other part of the body.
PopularScience_19210801_0099_002_0037.xml
article
35
35
MISCELLANY
[no value]
The Climbing Weather Man
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0038.xml
article
35
35
SHIPS AND SHIPBUILDING
[no value]
Are Foghorns to Become Obsolete ?
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0039.xml
article
35
35
[no value]
[no value]
Lining a Creek with Concrete
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0040.xml
article
35
35
RADIO
[no value]
He Tastes Radio Messages
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0041.xml
article
36
36
MISCELLANY
[no value]
Chain and Padlock for the Shoe-Lace
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0042.xml
article
36
36
MISCELLANY
[no value]
You Can Now Have Eyelashes to Order
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0043.xml
article
36
36
[no value]
[no value]
How Wood Is Tested for Strength
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0044.xml
article
36
36
[no value]
[no value]
The Oil-Saving Can with a Flexible Spout
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0045.xml
article
36
36
[no value]
[no value]
Ironing without Touching the Iron
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0046.xml
article
37
37
SPORTS AND PASTIMES
[no value]
How to Keep the Golf-Ball Clean
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0047.xml
article
37
37
[no value]
[no value]
Harvesting Sweet-Clover Seed
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0048.xml
article
37
37
SHIPS AND SHIPBUILDING
[no value]
The Largest Submarine Carries a Twelve-Inch Gun
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0049.xml
article
37
37
MISCELLANY
[no value]
A New Toothbrush Every Day
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0050.xml
article
37
37
[no value]
[no value]
Gather Corn the Cheaper Way
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0051.xml
article
38
38
[no value]
[no value]
Making the Repair of Faucets Easy
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0052.xml
article
38
38
[no value]
[no value]
You Can Carry this Washer in a Trunk
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0053.xml
article
38
38
NATURAL SCIENCE
[no value]
Where the Passaic River Flows into a Crack
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0054.xml
article
38
38
MISCELLANY
[no value]
How Did the Ship Get Inside?
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0055.xml
article
38
38
MISCELLANY
[no value]
Dried Caterpillars as Food
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0056.xml
article
38
38
[no value]
[no value]
Bayonets Make Good Wood-Cleavers
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0057.xml
article
39
39
MEDICINE AND SURGERY
[no value]
Respiration Is Measured with This Apparatus
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0058.xml
article
39
39
[no value]
[no value]
Mothering 1500 Chicks
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0059.xml
article
39
39
[no value]
[no value]
Getting More Wear Out of Shoes
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0060.xml
article
39
39
[no value]
[no value]
No More Arguments About the Dish-Washing
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0061.xml
article
39
39
MISCELLANY
[no value]
You May Hear Yourself as Others Hear You
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0062.xml
article
39
39
[no value]
[no value]
A Tiering-Truck Becomes a Hoist
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0063.xml
article
40
40
[no value]
[no value]
Learn How to Increase the Life of Your Shoes
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0064.xml
article
40
40
MEDICINE AND SURGERY
[no value]
How Glare Fatigues the Eye
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0065.xml
article
40
40
[no value]
[no value]
Would You Take the Blisters Out of Grass-Trimming?
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0066.xml
article
40
40
[no value]
[no value]
Making the Air Propeller Smaller and Faster
[no value]
[no value]
[no value]
[no value]
SOUND waves travel at about 1100 feet a second. Here is a new type of pro peller that can be driven at a tip speed of 1500 feet a second. The sound it produces is far higher in pitch than that of any air plane propeller, and its tip speed is higher than has ever been attained experiment ally, the previous record being about 900 feet a second.
PopularScience_19210801_0099_002_0067.xml
article
40
40
[no value]
[no value]
Sheep Under the Electric Clipper
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0068.xml
article
41
41
[no value]
[no value]
When a Blaze Starts the Bell Rings
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0069.xml
article
41
41
[no value]
[no value]
Cotton from Airplane “Dope”
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0070.xml
article
41
41
MISCELLANY
[no value]
Life on King’s Island
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0071.xml
article
41
41
[no value]
[no value]
Langley’s First Flying-Machine
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0072.xml
article
41
41
MISCELLANY
[no value]
Pull the Trigger from the Inside
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0073.xml
article
41
41
[no value]
[no value]
Making the Gas-Tank Safe
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0074.xml
article
42
42,43
MISCELLANY
[no value]
Underground Roads and Elevated Speedways May Solve the World’s Worst Traffic Tangle
Commissioner Enright’s Plan
Some Statistics
[no value]
[no value]
Raymond Francis Yates
APPROXIMATELY one third of the half million motor-cars in New York state are registered from the city of New York. One hundred and sixty-five thousand cars roll along its streets every day. New York’s traffic problem is a peculiar one. The greater part of the city, the busiest part, at least, is located on the long, narrow island of Manhattan.
PopularScience_19210801_0099_002_0075.xml
article
44
44
[no value]
[no value]
How Meteoric Dust Gets into Our Atmosphere
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0076.xml
article
45
45
NATURAL SCIENCE
[no value]
Two Hundred Tons Added to the Earth Daily
Shattered comets shower our planet with dust
What Happens to the Dust
Is the Aurora Borealis Made of Dust?
[no value]
[no value]
Scriven Bolton
THERE is not a spot on this globe that has not yielded what the housewife calls “dust.” It is found settling alike upon the white polar snows and on the Sahara desert, as well as on the decks of ocean-going ships. The earth is continually colliding with great swarms or clouds of dust and small particles, ranging in size from a pin's head to a walnut.
PopularScience_19210801_0099_002_0077.xml
article
45
45
SHIPS AND SHIPBUILDING
[no value]
What Is the Scoresby?
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0078.xml
article
46
46
SPORTS AND PASTIMES
[no value]
Taking a Close-Up of Young Birds in Their Nest
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0079.xml
article
46
46
[no value]
[no value]
Oranges Are Now Used in Making Vinegar
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0080.xml
article
46
46
MISCELLANY
[no value]
Accurate Predictions from a Dutch Weather-Glass
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0081.xml
article
47
47
MOTOR VEHICLES AND ACCESSORIES
[no value]
Nothing Stops This Gun
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0082.xml
article
47
47
[no value]
[no value]
Ambulance on Wings
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0083.xml
article
47
47
[no value]
[no value]
A Motion-Picture Cure for Faulty Acoustics
[no value]
[no value]
[no value]
[no value]
AN apparatus by which the action of sound waves and the phenomena of echoes and reverberations in auditoriums can be reproduced in moving-pictures has been invented by Dr. F. R. Watson, professor of physics at the University of Illinois. By means of this invention the acoustics of a proposed building can be tested out from the architect’s plans, making it possible to conquer echoes and other acoustic defects before, rather than after, the building is erected.
PopularScience_19210801_0099_002_0084.xml
article
48
48
PICTORIAL PAGES
[no value]
Drying Next Winters Fruits and Vegetables at Home
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0085.xml
article
49
49
PICTORIAL PAGES
[no value]
When Is a Pound Not a Pound?
Some of the tricks which unscrupulous tradesmen play with weights and scales
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0086.xml
article
50
50
[no value]
[no value]
Canceling 120 Letters a Minute
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0087.xml
article
50
50
SHIPS AND SHIPBUILDING
[no value]
Feet Are Needed to Propel This Boat
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0088.xml
article
50
50
MISCELLANY
[no value]
He Built a Wind-Shield for His Cigar-Lighter
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0089.xml
article
50
50
MISCELLANY
[no value]
Danger of Being a Prodigy
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0090.xml
article
50
50
[no value]
[no value]
This Machine Sews in Circles
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0091.xml
article
50
50
[no value]
[no value]
Good Roads Mean Prosperity for a Community
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0092.xml
article
51
51
MISCELLANY
[no value]
When the Elephant Gets a Cold
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0093.xml
article
51
51
MISCELLANY
[no value]
Build a House for Twenty Cents
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0094.xml
article
51
51
[no value]
[no value]
Hold the Transmitter to Your Throat in Telephoning
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0095.xml
article
51
51
[no value]
[no value]
Detecting Bubbles in Castings
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0096.xml
article
51
51
MEDICINE AND SURGERY
[no value]
Fresh Air by Megaphone
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0097.xml
article
51
51
[no value]
[no value]
Tripods Support Fire-Hose
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0098.xml
article
52
52
MISCELLANY
[no value]
When a Burglar Says “Hands Up”
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0099.xml
article
52
52
MISCELLANY
[no value]
Keep a Stove in Your Pocket
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0100.xml
article
52
52
MISCELLANY
[no value]
Steel Rope Holds Back Crowd
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0101.xml
article
52
52
NATURAL SCIENCE
[no value]
He Has Six Fingers on Each of His Hands
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0102.xml
article
52
52
SPORTS AND PASTIMES
[no value]
Acetylene Headlights for Hunters
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0103.xml
article
52
52
MISCELLANY
[no value]
This Strop Also Fits the Pocket
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0104.xml
article
53
53
[no value]
[no value]
Units of Electrical Resistance
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0105.xml
article
53
53
SHIPS AND SHIPBUILDING
[no value]
His Store Floats and Customers Arrive by Boat
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0106.xml
article
53
53
RADIO
[no value]
Sermons by Wireless
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0107.xml
article
53
53
[no value]
[no value]
It Bundles Grain into Shocks
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0108.xml
article
53
53
MISCELLANY
[no value]
Rubber Coats for Watches
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0109.xml
article
53
53
SPORTS AND PASTIMES
[no value]
How They Learn to Swim in Scotland
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0110.xml
article
54
54
[no value]
[no value]
This Little Implement Makes Knife-Sharpening Easy
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0111.xml
article
54
54
[no value]
[no value]
Salt Water Kills Grass
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0112.xml
article
54
54
[no value]
[no value]
Turn the Heating Plant into a Cooling System
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0113.xml
article
54
54
[no value]
[no value]
No Excuse for Letting the Tooth-Paste Dry
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0114.xml
article
54
54
[no value]
[no value]
The Spout Swings to the Tree
[no value]
[no value]
[no value]
[no value]
A FEW years hence the city of Glendale, California, plans to have one of the most beautiful oak-tree drives in the country. All trees along a five-mile motor thoroughfare have been removed and tiny live-oaks have been planted at regular intervals along the road.
PopularScience_19210801_0099_002_0115.xml
article
55
55
[no value]
[no value]
The Traveling Lawn-Mower and His Outfit
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0116.xml
article
55
55
MISCELLANY
[no value]
With a Hatpin She Makes Rye-Bread Flowers
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0117.xml
article
55
55
SPORTS AND PASTIMES
[no value]
Photographing the Last Lap
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0118.xml
article
55
55
MOTOR VEHICLES AND ACCESSORIES
[no value]
Is This an Automobile or a Motorcycle?
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0119.xml
article
55
55
[no value]
[no value]
Make Your Own Candler for Testing Eggs
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0120.xml
article
56
56
SHIPS AND SHIPBUILDING
[no value]
More Water for the Propeller
An ingenious device that lifts the water in shallow streams
How Additional Water Is Raised
Some of the Results
[no value]
[no value]
P. J. Risdon
WHEREVER shallow water is encountered in canals and little rivers, there is danger of boat propellers fouling the bottom. To prevent this the propellers are sometimes housed-in vertical recesses in the hull, known as “tunnels,” the tops of which slope downward fore and aft.
PopularScience_19210801_0099_002_0121.xml
article
57
57
[no value]
[no value]
Enameling with a Torch
[no value]
[no value]
[no value]
[no value]
IN the ordinary process of enameling, sheet iron is first freed from grease in an oven, cleansed and dried, then covered with a layer of enamel. This first layer is then melted in an oven, and an enamel of different composition applied, melted, and cooled slowly.
PopularScience_19210801_0099_002_0122.xml
article
57
57
SPORTS AND PASTIMES
[no value]
You Can Make Your Own Map of the Stars
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0123.xml
article
57
57
MEDICINE AND SURGERY
[no value]
Health Determined by the Amount of Oxygen Consumed
[no value]
[no value]
[no value]
[no value]
THE amount of oxygen consumed in performing a particular piece of work is believed to be a definite indication of a person’s health and general physical condition. To diagnose your health it is therefore as important to measure your oxygen supply as to take your pulse or temperature.
PopularScience_19210801_0099_002_0124.xml
article
58
58
PICTORIAL PAGES
[no value]
In the City of the Lilliputians
Seventy small people have their own fire department and police force in their own little town
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0125.xml
article
59
59
PICTORIAL PAGES
[no value]
Solving a Few of the Knotty Problems that Face the Photographer
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0126.xml
article
60
60
[no value]
[no value]
The Truck that Hugs the Barrel
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0127.xml
article
60
60
MISCELLANY
[no value]
To Strop Safety-Razor Blades
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0128.xml
article
60
60
MEDICINE AND SURGERY
[no value]
Lecturing to an Audience of Deaf People
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0129.xml
article
60
60
[no value]
[no value]
“Shines” Flow from This Brush
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0130.xml
article
60
60
[no value]
[no value]
Easier Work for the Glue-Makers
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0131.xml
article
60
60
[no value]
[no value]
It Floats and Is Sanitary
[no value]
[no value]
[no value]
[no value]
ONE day James W. Carrico saw his young son thrusting his arm into a pail of drinking-water and fishing for the cup. The boy was wet up to the shoulder, and undoubtedly the water was the richer by a few thousand germs. It was right there that the idea of the unsinkable cup was born.
PopularScience_19210801_0099_002_0132.xml
article
61
61
MISCELLANY
[no value]
Traffic Cops in San Francisco Merely Push a Button
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0133.xml
article
61
61
[no value]
[no value]
He Wears His Chair
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0134.xml
article
61
61
MEDICINE AND SURGERY
[no value]
Hungry Caterpillars Make Up This Moving Circle
[no value]
[no value]
[no value]
[no value]
PROCESSIONARY caterpillars will go round and round in a circle until they drop exhausted, because they haven’t much sense. These caterpillars usually travel in a procession, one of them becoming the leader and the others following blindly.
PopularScience_19210801_0099_002_0135.xml
article
61
61
[no value]
[no value]
Why You Should Not Melt Butter
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0136.xml
article
61
61
[no value]
[no value]
How the Fruit Train Can Be Cooled
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0137.xml
article
61
61
[no value]
[no value]
Wheeling the Baby Electrically
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0138.xml
article
62
62
[no value]
[no value]
Three-Point Suspension for Trousers
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0139.xml
article
62
62
SPORTS AND PASTIMES
[no value]
Take Your Own Camp Grate
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0140.xml
article
62
62
[no value]
[no value]
Balanced Rations for Chicks
[no value]
[no value]
[no value]
[no value]
ONCE upon a time, two tiny chicks broke through their shells at the same moment and fell into the hands of the Department of Agriculture. One chick was fed properly—his rations being carefully balanced. The other chick was fed the way the average farmer feeds his chicks —that is, in a haphazard fashion.
PopularScience_19210801_0099_002_0141.xml
article
62
62
[no value]
[no value]
We Now Have the Notched Hammer Handle
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0142.xml
article
62
62
SPORTS AND PASTIMES
[no value]
Specially Made Shoes to Wear on the Beach
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0143.xml
article
62
62
[no value]
[no value]
This Fan Fits Any Socket
[no value]
[no value]
[no value]
[no value]
THERE is now a small electric fan that will screw into any electric-light socket. It is threaded at the end like an electric bulb, and can be moved from place to place as easily. The fan blades have a metal guard around them to protect the fingers from possible injury.
PopularScience_19210801_0099_002_0144.xml
article
63
63
MEDICINE AND SURGERY
[no value]
Special Memorandum Pads for the Blind
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0145.xml
article
63
63
MISCELLANY
[no value]
The Fireless Cooker Field Oven
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0146.xml
article
63
63
[no value]
[no value]
Airships Are Now Moored to Mastlike Structures
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0147.xml
article
63
63
MISCELLANY
[no value]
By Their Beads Ye Shall Know Them
[no value]
[no value]
[no value]
[no value]
MOST of us have read of babies who were changed in the cradle and of the confusion arising therefrom; the subject has long been a fruitful one for story-writers. A certain maternity hospital in New York city is doing its best to avoid such accidents by a very simple scheme.
PopularScience_19210801_0099_002_0148.xml
article
63
63
[no value]
[no value]
Easy Days for the Bricklayer
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0149.xml
article
64
64
[no value]
[no value]
He Is Planning New Designs
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0150.xml
article
64
64
MISCELLANY
[no value]
Trying Out Goggles in Front of a Fan
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0151.xml
article
64
64
[no value]
[no value]
Safety Guard for Punch-Presses
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0152.xml
article
64
64
[no value]
[no value]
Five Jobs Accomplished on One Machine
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0153.xml
article
64
64
[no value]
[no value]
A Shower to Fit Any Bathtub
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0154.xml
article
64
64
MISCELLANY
[no value]
This Man Never Has to Hunt for His Glasses
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0155.xml
article
65
65
[no value]
[no value]
This Flashlight Works with Air
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0156.xml
article
65
65
[no value]
[no value]
It Sifts Ashes by the Ton
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0157.xml
article
65
65
MISCELLANY
[no value]
Dangling from the Bicycle She Lowers Center of Gravity
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0158.xml
article
65
65
[no value]
[no value]
For Chopping Wood with Your Feet
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0159.xml
article
65
65
[no value]
[no value]
Carry Your Hangar with You
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0160.xml
article
66
66
MISCELLANY
[no value]
Hair Is Now Singed Electrically
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0161.xml
article
66
66
MISCELLANY
[no value]
He Whittled a Portiere from Strips of Pine
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0162.xml
article
66
66
MISCELLANY
[no value]
Is the Movie Way Quicker?
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0163.xml
article
66
66
MISCELLANY
[no value]
Making the Alphabet Interesting
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0164.xml
article
66
66
MEDICINE AND SURGERY
[no value]
Curing Hiccoughs with Hot Water
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0165.xml
article
66
66
SPORTS AND PASTIMES
[no value]
The Whole Family Tricycles on This Machine
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0166.xml
article
67
67
SPORTS AND PASTIMES
[no value]
Steel Cables Drive This Bicycle
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0167.xml
article
67
67
[no value]
[no value]
Making the Barrel-Head Stay On
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0168.xml
article
67
67
SPORTS AND PASTIMES
[no value]
Golfers, Here Is a Device that Casts the Tee
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0169.xml
article
67
67
[no value]
[no value]
Hang Shelf Like a Picture
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0170.xml
article
67
67
[no value]
[no value]
How London Builds Her Roads
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0171.xml
article
67
67
[no value]
[no value]
Strengthen Merchandise Barrels with This Brace
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0172.xml
article
68
68
PICTORIAL PAGES
[no value]
Housekeeping Made Easy
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0173.xml
article
69
69,70
MISCELLANY
[no value]
Keeping Up with the March of Science
Facts for the man who wants to know
Gasoline Graded by Color
Why Car-Wheels Break
Forms of Color-Blindness
Beautifying Concrete Houses
Can Seasickness Be Cured?
Magnetic Steel Tests
Corncobs Have Their Uses
Deceived by the Eclipse
Sweet Potatoes Are Valuable
How Raindrops Are Formed
Some Plants Like the Cold
More Wood Alcohol
Sound Location by Birds
Prize for a Humane Trap
Guarding Against Radium
To Trace Ground-Water
Disease Destroys Glass
Room Temperatures
[no value]
[no value]
[no value]
SEVERAL grades of gasoline are in the market, greatly differing in their effectiveness, but so similar in appearance that even the eye of the expert cannot detect the difference. Since the prices are graded according to the quality of the gasoline, dishonest dealers make considerable extra profit by selling to their transient customers inferior gasoline at the price of superior grades.
PopularScience_19210801_0099_002_0174.xml
article
71
71
PICTORIAL PAGES
[no value]
Tools and Machines for Higher Efficiency
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0175.xml
article
72
72
[no value]
[no value]
Worn Automobile Parts Saved by Plating
A remarkable method of repairing machine parts that has unlimited industrial possibilities
[no value]
[no value]
P. J. Risdon
WHEN you electroplate, you coat with a valuable metal, such as gold, silver, or copper, an article made of a baser metal. The article to be coated is connected with an electric circuit and immersed in a chemical solution so as to constitute what is called an electrode—that is, a terminal to or from which the electric current flows through the solution.
PopularScience_19210801_0099_002_0176.xml
article
72
72
[no value]
[no value]
How to Carry Out the Wonderful Electro-Deposition Process
Producing the Fine White Surface
Larger Repairs May Be Possible
[no value]
[no value]
[no value]
THE process of depositing a coating of iron that has been successfully carried out in England and France is as follows: The article to be coated is first cleaned with gasoline to remove all oil and grease. It is then immersed for twelve hours in a bath containing a scalding solution of caustic and washing soda at a temperature of 194° F., after which it is rinsed and cleaned thoroughly with wire brushes.
PopularScience_19210801_0099_002_0177.xml
article
73
73
[no value]
[no value]
Electro-Deposition of Iron on Metal Parts
[no value]
[no value]
[no value]
[no value]
Mr. Davis’ drawing shows in detail the process for coating metal with iron now being used extensively in England and France in the automobile-repair trade. It is possible by this process to deposit a coating of iron of one twelfth of an inch on an object of cylindrical shape.
PopularScience_19210801_0099_002_0178.xml
article
74
74,75
MOTOR VEHICLES AND ACCESSORIES
[no value]
Automobilists—Don’t Miss the New Car Accessories Pictured on These Pages
When You Want Expert Advice About Your Car
[no value]
[no value]
[no value]
IN these pages of ideas about automobiles and motor-trucks the Popular Science Monthly endeavors to help its readers solve problems of maintenance and repair. But there must be special cases that are not covered, and we invite you to write to the Automobile Editor and let him advise you.
PopularScience_19210801_0099_002_0179.xml
article
76
76
MOTOR VEHICLES AND ACCESSORIES
[no value]
It Carries Forty-Foot Girders
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0180.xml
article
76
76
MOTOR VEHICLES AND ACCESSORIES
[no value]
Revolutionizing the Engine
[no value]
[no value]
[no value]
[no value]
A WELL known company has introduced a motor-truck engine with several features of design that bid fair to become popular, also a revolutionary transmission design by which both speed and pulling power are increased. The new transmission provides speed in direct drive as well as pulling power in the lower gears that does not necessitate an engine of excessive size.
PopularScience_19210801_0099_002_0181.xml
article
76
76
MOTOR VEHICLES AND ACCESSORIES
[no value]
Bricks Dumped in Stacks
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0182.xml
article
76
76
MOTOR VEHICLES AND ACCESSORIES
[no value]
Does the Spark-Lever Mean Anything to You?
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0183.xml
article
77
77,78
MOTOR VEHICLES AND ACCESSORIES
[no value]
Tools for Truck Repairs
A dollar in time for maintenance saves many repairs
[no value]
[no value]
Joseph Brinker
FOR every three dollars spent on a motor-truck, one dollar goes for maintenance. The lack of one dollar spent on maintenance at the proper time may mean an unexpected break-down on the road and a loss of from ten to twenty-five dollars in operating income or the expenditure of an equal amount to get a second truck to complete the work of the first.
PopularScience_19210801_0099_002_0184.xml
article
78
78
MOTOR VEHICLES AND ACCESSORIES
[no value]
Write to Us About Your Motor Troubles
The Popular Science Monthly invites you to send your automobile problems to the Automobile Editor. He can tell you anything you want to know about a car, and he is here to help you
Determining Battery Poles
Advantages of Four Valves
Re-Using Lubricating Oil
Soapstone in Tire Casings
To-Day’s Gasoline
Delivery Costs and Sales
[no value]
[no value]
[no value]
Q.—Can a voltmeter be used to determine the negative and positive poles of a battery and if so, how?—J. B. B., Chicago, Ill. A.—A voltmeter can be employed to determine battery poles by touching the voltmeter poles instantaneously across the circuit.
PopularScience_19210801_0099_002_0185.xml
article
79
79
PRACTICAL WORKERS
[no value]
A Priming-Cup for the Intake Manifold
[no value]
[no value]
[no value]
Robert A. Chandler
A RIGHT-ANGLED priming-cup set at the fork of the intake manifold on the Ford engine will be found to be one of the most useful fittings on the car. It is seriously needed on the Ford, but may be used on many other engines to advantage. If a dash control is added, as shown, its utility is very much increased.
PopularScience_19210801_0099_002_0186.xml
article
79
79
PRACTICAL WORKERS
[no value]
Sun- and Rain-Shield for the Automobile
[no value]
[no value]
[no value]
G.A.LUERS
[no value]
PopularScience_19210801_0099_002_0187.xml
article
79
79
PRACTICAL WORKERS
[no value]
An Emergency Repair of a Clutch-Pedal Stud
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0188.xml
article
79
79
PRACTICAL WORKERS
[no value]
Removing the Ford Wheel Spindle Cone
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0189.xml
article
80
80
PRACTICAL WORKERS
[no value]
A Hinged Support for the Coffee-Mill
[no value]
[no value]
[no value]
EVERETT ROGERS
[no value]
PopularScience_19210801_0099_002_0190.xml
article
80
80
PRACTICAL WORKERS
[no value]
Keep Your Valuables in an Alarm Safety Box
[no value]
[no value]
[no value]
GEORGE BENNER
[no value]
PopularScience_19210801_0099_002_0191.xml
article
80
80
PRACTICAL WORKERS
[no value]
This Iron-Pipe Gate Will Close Itself
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0192.xml
article
80
80
PRACTICAL WORKERS
[no value]
A Homemade Holder for Pens and Letters
[no value]
[no value]
[no value]
ARTHUR GOLDENBAUM
[no value]
PopularScience_19210801_0099_002_0193.xml
article
80
80
PRACTICAL WORKERS
[no value]
Hold the Faucet Open with a Key-Ring
[no value]
[no value]
[no value]
ANTHONY E. ZIPPRICH
FAUCETS of the type shown in the accompanying illustration are employed very often in hotels, clubs, lavatories, restaurants, etc. In this type the inconvenience of having to employ one hand to maintain a flow of water is apparent. The illustration shows a method of avoiding this handicap by a simple expedient, a key-ring, which practically every man carries.
PopularScience_19210801_0099_002_0194.xml
article
80
80
PRACTICAL WORKERS
[no value]
How to Keep the Pen with the Ink-Bottle
[no value]
[no value]
[no value]
CARL ROYER
[no value]
PopularScience_19210801_0099_002_0195.xml
article
80
80
PRACTICAL WORKERS
[no value]
Old Rope Can Be Used for a Doormat
[no value]
[no value]
[no value]
L. LAURIER
[no value]
PopularScience_19210801_0099_002_0196.xml
article
81
81
PRACTICAL WORKERS
[no value]
Constructing a Table for Photographers
[no value]
[no value]
[no value]
Ernest Barton
AN amateur photographer’s greatest help is a table suitable for all kinds of photographic work. It consists of two lateral frames between which the table proper can be inclined at any reasonable angle to facilitate the work. It also carries two sliding tops that enable the photographer to take macrophotos by simply introducing bellow extensions.
PopularScience_19210801_0099_002_0197.xml
article
81
81
PRACTICAL WORKERS
[no value]
To Keep Your Magazines in Order
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0198.xml
article
82
82
PRACTICAL WORKERS
[no value]
Coil-Winding Suggestions for the Amateur
[no value]
[no value]
[no value]
H. H. Parker
WINDING a coil of insulated wire for an electromagnet, dynamo field, or transformer becomes an easy operation if the amateur follows the directions given below: In Fig. 1 is shown a coil wound upon a round core. To simplify matters, a single layer of wire is shown, but the same principles would apply to a coil of any number of layers.
PopularScience_19210801_0099_002_0199.xml
article
82
82
PRACTICAL WORKERS
[no value]
The Camera Romantic for Home Use
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0200.xml
article
83
83
PRACTICAL WORKERS
[no value]
Suggestions for Training Dwarfed Fruit-Trees
Trees That Cannot Be Forced
Some of the Forms that Are Used
[no value]
[no value]
E. Bade
DWARFED fruit-trees are always grafted on slow-growing root stocks. They should never be planted so low in the soil that they touch, or cover, the grafting scar. If they are planted too low, they will detach themselves from the rootstock, produce their own roots, and soon lose the entire appearance of a dwarfed fruit-tree.
PopularScience_19210801_0099_002_0201.xml
article
84
84
PRACTICAL WORKERS
[no value]
To Make Various Kinds of Electrical Switches
[no value]
[no value]
[no value]
L. A. Laurier
[no value]
PopularScience_19210801_0099_002_0202.xml
article
84
84
PRACTICAL WORKERS
[no value]
Electric Motor for Sewing-Machines
[no value]
[no value]
[no value]
[no value]
SIMPLE but efficient is this method of attaching a motor to a sewing-machine. A small electric motor of sufficient power to operate the machine is necessary. A wooden block support is placed back of the balance wheel and screwed to the machine top from beneath.
PopularScience_19210801_0099_002_0203.xml
article
85
85
PRACTICAL WORKERS
[no value]
Protect Your House with an Automatic Fire-Alarm
[no value]
[no value]
[no value]
HENRY A. GERMAIN
THE automatic fire-alarm here described is simple and inexpensive and can be made by any one with a saw and a few drills. The perspective drawing will show the general construction and assembly. A light L-shaped wooden frame, screwed fast to a supporting back of the same material, carries on a pivot at O the twisted copper strip C, which is in electrical contact with one side of a circuit entering at X.
PopularScience_19210801_0099_002_0204.xml
article
85
85
PRACTICAL WORKERS
[no value]
Coloring Makes Stereoscopic Pictures More Attractive
[no value]
[no value]
[no value]
E. BADE
[no value]
PopularScience_19210801_0099_002_0205.xml
article
85
85
PRACTICAL WORKERS
[no value]
When Reaming Is Done with Undersize Reamers
[no value]
[no value]
[no value]
[no value]
WHEN rebushing connecting-rods in the steering-gear, or spring shackles, it is frequently found that available reamers are either too large or too small. It is frequently suggested that pieces of tin be placed at the side of the reamer: but those who have tried this method will agree it is difficult to obtain satisfactory results.
PopularScience_19210801_0099_002_0206.xml
article
85
85
PRACTICAL WORKERS
[no value]
This Toy Airplane Will Shoot Out of Its Hangar
[no value]
[no value]
[no value]
CARL ROYER
[no value]
PopularScience_19210801_0099_002_0207.xml
article
86
86
PRACTICAL WORKERS
[no value]
Foiling the Burglar with a Piece of Wire
[no value]
[no value]
[no value]
H. C. ROWELL
WHEN locking their doors, most persons think it sufficient precaution to leave the key in the lock to prevent the lock beinig picked or another key from being fitted from the outside. While this practice might foil the amateur housebreaker, it is of great assistance to the professional in gaining entrance.
PopularScience_19210801_0099_002_0208.xml
article
86
86
PRACTICAL WORKERS
[no value]
How to Make a Daniell Cell from Simple Materials
[no value]
[no value]
[no value]
W. H. HOSCHKE
AMATEUR electricians know that a Daniell cell is best on closed-circuit work. It does not polarize rapidly and is therefore well suited to the needs of the amateur electrician’s laboratory. A few cells will produce sufficient current to operate small motors, bells, etc.
PopularScience_19210801_0099_002_0209.xml
article
86
86
PRACTICAL WORKERS
[no value]
Artistic Book-Ends of Sheet Metal
[no value]
[no value]
[no value]
M. J. MUNSON
[no value]
PopularScience_19210801_0099_002_0210.xml
article
86
86
PRACTICAL WORKERS
[no value]
A Blue-Print Machine from an Old Bottle
[no value]
[no value]
[no value]
JOSEPH B. MORAN
[no value]
PopularScience_19210801_0099_002_0211.xml
article
86
86
PRACTICAL WORKERS
[no value]
How a Simple Snap-Hook Was Evolved
[no value]
[no value]
[no value]
L. B. ROBBINS
[no value]
PopularScience_19210801_0099_002_0212.xml
article
86
86
PRACTICAL WORKERS
[no value]
To Insert Several Carbon Copies in Typewriter
[no value]
[no value]
[no value]
D. S. WRIGHT
[no value]
PopularScience_19210801_0099_002_0213.xml
article
87
87
PRACTICAL WORKERS
[no value]
Sawdust Is a Good Cleanser of Oily Hands
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0214.xml
article
87
87
PRACTICAL WORKERS
[no value]
Use This Book-Rest with a Lamp Attachment
[no value]
[no value]
[no value]
WILLIAM E. KING
[no value]
PopularScience_19210801_0099_002_0215.xml
advertisement
87
87
[no value]
[no value]
ENDERS SALES COMPANY: Enders SAFETY RAZOR
[no value]
ENDERS SALES COMPANY
Enders SAFETY RAZOR
[no value]
[no value]
PopularScience_19210801_0099_002_0216.xml
advertisement
88
88
[no value]
[no value]
CLARK-TURNER PISTON CO.: DELUXE PISTONS
[no value]
CLARK-TURNER PISTON CO.
DELUXE PISTONS
[no value]
[no value]
PopularScience_19210801_0099_002_0217.xml
advertisement
88
88
[no value]
[no value]
THE NAVARRE COMPANY: NAVARREQuality Binocular
[no value]
THE NAVARRE COMPANY
NAVARREQuality Binocular
[no value]
[no value]
PopularScience_19210801_0099_002_0218.xml
advertisement
88
88
[no value]
[no value]
JOHNSON SMITH & CO.: BLANK CARTRIDGE PISTOL
[no value]
JOHNSON SMITH & CO.
BLANK CARTRIDGE PISTOL
[no value]
[no value]
PopularScience_19210801_0099_002_0219.xml
article
88
88
PRACTICAL WORKERS
[no value]
New Uses for Electricity
Rules Governing the Contest
[no value]
[no value]
[no value]
ELECTRICITY is one of our most useful servants. An outline of its more common daily uses would fill a book of no mean size. The editors of the Popular Science Monthly want to find some uncommon uses for electricity. They want to know what new uses readers of the magazine have found for it in home, shop, or office.
PopularScience_19210801_0099_002_0220.xml
article
89
89
PRACTICAL WORKERS
[no value]
An Extra Hook for the Telephone Receiver
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0221.xml
article
89
89
PRACTICAL WORKERS
[no value]
Making Good Use of Old Phonograph Records
[no value]
[no value]
[no value]
JOSEPH B. MORAN
[no value]
PopularScience_19210801_0099_002_0222.xml
article
89
89
PRACTICAL WORKERS
[no value]
Model Your Own Stoppers from Paper
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0223.xml
advertisement
89
89
[no value]
[no value]
AMERICAN TELEPHONE AND TELEGRAPH COMPANY AND ASSOCIATED COMPANIES: “ BELL SYSTEM "
[no value]
AMERICAN TELEPHONE AND TELEGRAPH COMPANY AND ASSOCIATED COMPANIES
“ BELL SYSTEM "
[no value]
[no value]
PopularScience_19210801_0099_002_0224.xml
advertisement
89
89
[no value]
[no value]
CENTRAL CAMERA CO.: GRAFLEX-KODAKS
[no value]
CENTRAL CAMERA CO.
GRAFLEX-KODAKS
[no value]
[no value]
PopularScience_19210801_0099_002_0225.xml
advertisement
89
89
[no value]
[no value]
MELLINGER TIRE & RUBBER CO.
[no value]
MELLINGER TIRE & RUBBER CO.
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0226.xml
advertisement
89
89
[no value]
[no value]
OHIO MECHANICS INSTITUTE
[no value]
OHIO MECHANICS INSTITUTE
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0227.xml
advertisement
90
90
[no value]
[no value]
SHAW MANUFACTURING CO.: Shaw Motor Attachment
[no value]
SHAW MANUFACTURING CO.
Shaw Motor Attachment
[no value]
[no value]
PopularScience_19210801_0099_002_0228.xml
advertisement
90
90
[no value]
[no value]
Standard Business Training Institute
[no value]
Standard Business Training Institute
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0229.xml
advertisement
90
90
[no value]
[no value]
The Adams-Barre Co.
[no value]
The Adams-Barre Co.
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0230.xml
advertisement
90
90
[no value]
[no value]
THE CLEVELAND MOTORCYCLE CO.: Cleveland LIGHTWEIGHT MOTORCYCLE
[no value]
THE CLEVELAND MOTORCYCLE CO.
Cleveland LIGHTWEIGHT MOTORCYCLE
[no value]
[no value]
PopularScience_19210801_0099_002_0231.xml
article
90
90
PRACTICAL WORKERS
[no value]
Why Not Make a Skip-Jack Sailboat?
[no value]
[no value]
[no value]
[no value]
THIS skip-jack sailboat can be put together for about twenty dollars and many hundred dollars worth of pure fun may be had with it in a single season. The boat is really a scow with a sail on it. It is splendid to swim from, since it will not tip. It must be admitted right here that this is not a rough-water boat.
PopularScience_19210801_0099_002_0232.xml
article
90
90
PRACTICAL WORKERS
[no value]
You Should Protect the Drainpipe Outlets
[no value]
[no value]
[no value]
B. FRANCIS DASHIELL
[no value]
PopularScience_19210801_0099_002_0233.xml
article
90
90
PRACTICAL WORKERS
[no value]
An Adjustable Platform Step for the Ladder
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0234.xml
article
91
91
PRACTICAL WORKERS
[no value]
Moor Rowboats to Prevent Them from Chafing
[no value]
[no value]
[no value]
L. B. ROBBINS
WHEN rowboats are moored to the shore or a dock by a bowline, the wind, tide, or current tends to swing them back and forth and chafe them against permanent projections. This can be remedied as follows: Drop a heavy mooring anchor about three boat-lengths from the shore.
PopularScience_19210801_0099_002_0235.xml
article
91
91
PRACTICAL WORKERS
[no value]
Try a Safety-Razor Blade for Card-Cutting
[no value]
[no value]
[no value]
EVERETT ROGERS
[no value]
PopularScience_19210801_0099_002_0236.xml
advertisement
91
91
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0237.xml
advertisement
92
92
[no value]
[no value]
Haywood Tire & Equipment Co.
[no value]
Haywood Tire & Equipment Co.
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0238.xml
advertisement
92
92
[no value]
[no value]
L. W. SWEET, INC.: 21 Jewel Illinois
[no value]
L. W. SWEET, INC.
21 Jewel Illinois
[no value]
[no value]
PopularScience_19210801_0099_002_0239.xml
advertisement
92
92
[no value]
[no value]
LEIMAN BROS.: AIR PUMPS
[no value]
LEIMAN BROS.
AIR PUMPS
[no value]
[no value]
PopularScience_19210801_0099_002_0240.xml
advertisement
92
92
[no value]
[no value]
The Central Auto Supply Co.
[no value]
The Central Auto Supply Co.
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0241.xml
article
92
92
PRACTICAL WORKERS
[no value]
How to Make a Carbon-Pile Rheostat
[no value]
[no value]
[no value]
[no value]
A CARBON-PILE rheostat is a form of resistance that is very useful in the small laboratory. It is surprising how few amateur electricians know of this device. In a pile of flat pieces of carbon the electrical resistance will depend upon the contact between the individual pieces, and this contact will in turn depend upon the pressure applied.
PopularScience_19210801_0099_002_0242.xml
article
92
92
PRACTICAL WORKERS
[no value]
Steam Turbine with a Tin-Can Boiler
[no value]
[no value]
[no value]
L. LAURIER
[no value]
PopularScience_19210801_0099_002_0243.xml
article
92
92
PRACTICAL WORKERS
[no value]
A Chandelier Devised from Bicycle-Wheel Hoop
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0244.xml
article
93
93
PRACTICAL WORKERS
[no value]
You Can Produce Gas from Old Newspapers
[no value]
[no value]
[no value]
GEORGE H. HOLDEN
OLD newspapers yield a considerable volume of illuminating gas when used as described below. Get an old syrup-can complete with an airtight fitting lid. Punch or drill a hole in the lid to receive a length of ¼-in. brass gas-piping, and make a good joint.
PopularScience_19210801_0099_002_0245.xml
article
93
93
PRACTICAL WORKERS
[no value]
Nails Hammered in the Wall so They Will Hold
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0246.xml
advertisement
93
93
[no value]
[no value]
The Magnet Light Co.: Magnet-Lite
[no value]
The Magnet Light Co.
Magnet-Lite
[no value]
[no value]
PopularScience_19210801_0099_002_0247.xml
advertisement
93
93
[no value]
[no value]
Advertisement: POPULAR SCIENCE MONTHLY
[no value]
[no value]
POPULAR SCIENCE MONTHLY
[no value]
[no value]
PopularScience_19210801_0099_002_0248.xml
advertisement
93
93
[no value]
[no value]
Advertisement: POPULAR SCIENCE MONTHLY
[no value]
[no value]
POPULAR SCIENCE MONTHLY
[no value]
[no value]
PopularScience_19210801_0099_002_0249.xml
advertisement
93
93
[no value]
[no value]
A. B. ELECTRIC CO.
[no value]
A. B. ELECTRIC CO.
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0250.xml
advertisement
94
94
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0251.xml
article
94
94
PRACTICAL WORKERS
[no value]
Here’s an Idea on Washing Photographic Prints
[no value]
[no value]
[no value]
GEORGE BENDER
HERE is a good suggestion for the amateur photographer. When the water is allowed to run full force into the photographic washing-tray, a current is created. The prints come in contact with one another and stick together. They are prevented from receiving the proper amount of washing in this way.
PopularScience_19210801_0099_002_0252.xml
article
94
94
PRACTICAL WORKERS
[no value]
How to Remove Kinks in Wire
[no value]
[no value]
[no value]
FRANK HARAZIM
[no value]
PopularScience_19210801_0099_002_0253.xml
article
94
94
PRACTICAL WORKERS
[no value]
Wire Terminals Made from Brass Tubing
[no value]
[no value]
[no value]
CARL ROYER
[no value]
PopularScience_19210801_0099_002_0254.xml
article
94
94
PRACTICAL WORKERS
[no value]
This Window-Lock Will Actually Lock
[no value]
[no value]
[no value]
L. B. ROBBINS
[no value]
PopularScience_19210801_0099_002_0255.xml
article
94
94
PRACTICAL WORKERS
[no value]
Build This Shoe-Polisher at Home
[no value]
[no value]
[no value]
MATTHEW POTTS
[no value]
PopularScience_19210801_0099_002_0256.xml
advertisement
95
95
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0257.xml
article
95
95
PRACTICAL WORKERS
[no value]
Improvising a Depth-Gage in an Emergency
[no value]
[no value]
[no value]
L . LAURIER
[no value]
PopularScience_19210801_0099_002_0258.xml
article
95
95
PRACTICAL WORKERS
[no value]
A Homemade Punch for Use in Embroidering
[no value]
[no value]
[no value]
C. NYE
[no value]
PopularScience_19210801_0099_002_0259.xml
article
95
95
PRACTICAL WORKERS
[no value]
To Produce a Black Stain on Polished Brass
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0260.xml
advertisement
96
96
[no value]
[no value]
Advertisement: Popular Science Monthly
[no value]
[no value]
Popular Science Monthly
[no value]
[no value]
PopularScience_19210801_0099_002_0261.xml
article
96
96
PRACTICAL WORKERS
[no value]
How You Can Economize on Hacksaw Blades
[no value]
[no value]
[no value]
GEO. H. HOLDEN
[no value]
PopularScience_19210801_0099_002_0262.xml
article
96
96
PRACTICAL WORKERS
[no value]
Cool Beverages without the Use of Ice
[no value]
[no value]
[no value]
W. T. PERRY
PRACTICAL and simple is this method of cooling beverages so that they are refreshing as well as palatable. It is based on the rapid evaporation of water. The liquid to be cooled is placed in a preferably thin-walled container. Around this is wrapped a towel well soaked with cold water.
PopularScience_19210801_0099_002_0263.xml
article
96
96
PRACTICAL WORKERS
[no value]
News-Drawings Can Be Easily Transferred
[no value]
[no value]
[no value]
E. A. McCANN
[no value]
PopularScience_19210801_0099_002_0264.xml
article
96
96
PRACTICAL WORKERS
[no value]
For Holding Screws in a Vise with a Clamp
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0265.xml
article
96
96
PRACTICAL WORKERS
[no value]
Toy Boats Constructed with Pliable Cardboard
[no value]
[no value]
[no value]
JOSEPH B. MORGAN
[no value]
PopularScience_19210801_0099_002_0266.xml
advertisement
97
97
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0267.xml
article
97
97
PRACTICAL WORKERS
[no value]
Add a Revolving Roaster to the Kitchen
[no value]
[no value]
[no value]
W. A. JACKSON
[no value]
PopularScience_19210801_0099_002_0268.xml
article
97
97
PRACTICAL WORKERS
[no value]
One Way of Truing Up the Emery Wheel
[no value]
[no value]
[no value]
JOSEPH B. MORAN
[no value]
PopularScience_19210801_0099_002_0269.xml
advertisement
98
98
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0270.xml
article
98
98
PRACTICAL WORKERS
[no value]
Safety-Razor-Blade Holder from a Clothespin
[no value]
[no value]
[no value]
FRED C. DAVIS
DISCARDED safety-razor blades may be used for ripping seams, by the photographer for cutting masks or mats and in many other ways. The difficulty of their use lies in the inability to comfortably handle them alone. A clothespin, though, can be turned, in a few minutes, into a very satisfactory handle for the blades.
PopularScience_19210801_0099_002_0271.xml
article
98
98
PRACTICAL WORKERS
[no value]
A Lunch-Box Made from an Old Book
[no value]
[no value]
[no value]
JOSEPH B. MORAN
A LUNCH-BOX can be made from an old book of the proper thickness and size. With a straightedge and an old safety-razor blade, the center of the pages are cut out as shown. When this is done, a thick preparation of glue is smeared around the inside and over this pieces of cardboard, cut to the proper size, are placed.
PopularScience_19210801_0099_002_0272.xml
article
98
98
PRACTICAL WORKERS
[no value]
Protect Your Bank Account Against Forgers
[no value]
[no value]
[no value]
GEO. H. HOLDEN
[no value]
PopularScience_19210801_0099_002_0273.xml
advertisement
99
99
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0274.xml
article
99
99
PRACTICAL WORKERS
[no value]
Panels in the Screen Door Make It Rainproof
[no value]
[no value]
[no value]
R. NEWBECKER
[no value]
PopularScience_19210801_0099_002_0275.xml
article
99
99
PRACTICAL WORKERS
[no value]
How a Basket Became a Baby-Carriage
[no value]
[no value]
[no value]
PAUL J. KURTZ
[no value]
PopularScience_19210801_0099_002_0276.xml
advertisement
100
100
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0277.xml
article
100
100
PRACTICAL WORKERS
[no value]
Make Your Individual Drinking-Cup of Paper
[no value]
[no value]
[no value]
F. EVERARD JORDAN
[no value]
PopularScience_19210801_0099_002_0278.xml
article
100
100
PRACTICAL WORKERS
[no value]
Wiring Flower-Pots to the Porch Railing
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0279.xml
article
100
100
PRACTICAL WORKERS
[no value]
How to Fasten a Pulley on the End of a Shaft
[no value]
[no value]
[no value]
G. BENDER
[no value]
PopularScience_19210801_0099_002_0280.xml
article
101
101
PRACTICAL WORKERS
[no value]
An Eolian Harp that Is Simply Constructed
[no value]
[no value]
[no value]
E. A. McCANN
[no value]
PopularScience_19210801_0099_002_0281.xml
article
101
101
PRACTICAL WORKERS
[no value]
This Vise Will Successfully Hold Small Tubing
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0282.xml
advertisement
101
101
[no value]
[no value]
VICTOR J. EVANS & CO.
[no value]
VICTOR J. EVANS & CO.
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0283.xml
advertisement
102
102
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0284.xml
article
102
102
PRACTICAL WORKERS
[no value]
Old Trunk as a Tool-Chest for Wall
[no value]
[no value]
[no value]
CHARLES A. GODDARD
[no value]
PopularScience_19210801_0099_002_0285.xml
article
102
102
PRACTICAL WORKERS
[no value]
How to Make a Set of Dinner Chimes
[no value]
[no value]
[no value]
JOSEPH B. MORAN
[no value]
PopularScience_19210801_0099_002_0286.xml
article
103
103
PRACTICAL WORKERS
[no value]
A Waste-Basket from a Cardboard Box
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0287.xml
article
103
103
PRACTICAL WORKERS
[no value]
Sandpapering Rendered Easy with This Block
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0288.xml
article
103
103
PRACTICAL WORKERS
[no value]
To Increase the Diameter of a Pulley
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0289.xml
advertisement
103
103
[no value]
[no value]
HENRY J. RAHE
[no value]
HENRY J. RAHE
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0290.xml
advertisement
103
103
[no value]
[no value]
Mead Cycle Company
[no value]
Mead Cycle Company
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0291.xml
advertisement
103
103
[no value]
[no value]
THE WILLIAM B. DUCK COMPANY
[no value]
THE WILLIAM B. DUCK COMPANY
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0292.xml
advertisement
103
103
[no value]
[no value]
The Rudolph Wurlitzer Co.
[no value]
The Rudolph Wurlitzer Co.
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0293.xml
advertisement
104
104
[no value]
[no value]
INTERNATIONAL CORRESPONDENCE SCHOOLS
[no value]
INTERNATIONAL CORRESPONDENCE SCHOOLS
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0294.xml
article
104
104
PRACTICAL WORKERS
[no value]
Gesso-Work Is Not Difficult to Learn
[no value]
[no value]
[no value]
E. A. McCann
GESSO is the composition of which framemakers model the fancy scroll-work and such like on to their moldings. To make it, heat some ordinary glue in a double vessel. The regular glue-pot is the best, but two cans, one inside the other will do, the outer filled with water and kept boiling, until the glue in the inner can, mixed with a little water, is melted.
PopularScience_19210801_0099_002_0295.xml
article
104
104
PRACTICAL WORKERS
[no value]
Two Gourds Furnish One Life-Preserver
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0296.xml
article
104
104
PRACTICAL WORKERS
[no value]
Emergency Spokeshave from a Razor-Blade
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0297.xml
article
105
105
PRACTICAL WORKERS
[no value]
A Homemade Scraper for the Lawn
[no value]
[no value]
[no value]
G. BENDER
IF a lawn is to be leveled, this homemade scraper will be found very useful. Two large blocks of wood about 6 in. thick and 5 ft. long, are held together with two iron rods threaded at each end. Holes are drilled in the heavy wooden pieces to accommodate the rods.
PopularScience_19210801_0099_002_0298.xml
article
105
105
PRACTICAL WORKERS
[no value]
You Can Enjoy Cool Breezes without Catching Cold
[no value]
[no value]
[no value]
W. T. PERRY
[no value]
PopularScience_19210801_0099_002_0299.xml
advertisement
105
105
[no value]
[no value]
BROWN & SHARPE Mfg.Co.: BROWN & SHARPE MACHINISTS’ TOOLS
[no value]
BROWN & SHARPE Mfg.Co.
BROWN & SHARPE MACHINISTS’ TOOLS
[no value]
[no value]
PopularScience_19210801_0099_002_0300.xml
advertisement
105
105
[no value]
[no value]
Northwestern Electric Company: ALTERNATING CURRENT MOTORS
[no value]
Northwestern Electric Company
ALTERNATING CURRENT MOTORS
[no value]
[no value]
PopularScience_19210801_0099_002_0301.xml
advertisement
106
106
[no value]
[no value]
THE STANLEY WORKS: STANLEY Carpenters’ Tools
[no value]
THE STANLEY WORKS
STANLEY Carpenters’ Tools
[no value]
[no value]
PopularScience_19210801_0099_002_0302.xml
advertisement
106
106
[no value]
[no value]
The Monarch Machine Tool Co.: Monarch Lathes
[no value]
The Monarch Machine Tool Co.
Monarch Lathes
[no value]
[no value]
PopularScience_19210801_0099_002_0303.xml
article
106
106
PRACTICAL WORKERS
[no value]
To Build an Electric Calliope
[no value]
[no value]
[no value]
L. A. Laurier
BUILDING an electric calliope is simple, and the materials, aside from the electric motor, are quite inexpensive. The motor driving the device must be of the 110-volt style, some small fraction of a horsepower. If a perforated disk is traveling at high speed and a jet of air is directed against the perforations; a shrill whistle will be produced, providing the disk is traveling fast enough and the air is at high enough pressure.
PopularScience_19210801_0099_002_0304.xml
article
106
106
PRACTICAL WORKERS
[no value]
Cord-Holder and -Cutter for the Home
[no value]
[no value]
[no value]
P. P. AVERY
THOSE who are frequently called upon to tie up parcels will find the cord-holder and -cutter described here a valuable addition to domestic time and labor savers. A ⅞-in. board, 6 in. by 10 in., forms the foundation. A cylindrical tin can of 5 in. diameter and 6 in. high is nailed to the board with small nails driven through the bottom of the can.
PopularScience_19210801_0099_002_0305.xml
advertisement
107
107
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0306.xml
article
107
107
PRACTICAL WORKERS
[no value]
A Coil-Winding Mandrel with Removable Core
[no value]
[no value]
[no value]
W. C. ROYER
[no value]
PopularScience_19210801_0099_002_0307.xml
article
107
107
PRACTICAL WORKERS
[no value]
For Holding the Washboard in Place
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0308.xml
article
107
107
PRACTICAL WORKERS
[no value]
Two Scrub-Brushes Will Make a Foot-Wiper
[no value]
[no value]
[no value]
MATTHEW POTTS
[no value]
PopularScience_19210801_0099_002_0309.xml
advertisement
108
108
[no value]
[no value]
SARGENT & COMPANY: Sargent Noiseless Screen Door Closers
[no value]
SARGENT & COMPANY
Sargent Noiseless Screen Door Closers
[no value]
[no value]
PopularScience_19210801_0099_002_0310.xml
advertisement
108
108
[no value]
[no value]
THE EDWARDS MFG. CO.
[no value]
THE EDWARDS MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0311.xml
article
108
108
PRACTICAL WORKERS
[no value]
On Collecting and Mounting Butterflies
[no value]
[no value]
[no value]
E. Bade
NEXT to a net, the most essential requisite of a butterfly-collector is collecting glasses into which the specimens are thrust. These are bottles having wide mouths and usually containing cyanide of potassium, which kills the butterflies quickly and painlessly.
PopularScience_19210801_0099_002_0312.xml
article
108
108
PRACTICAL WORKERS
[no value]
An Economical Homemade Tool-Holder
[no value]
[no value]
[no value]
W. F. SCHAPHORST
[no value]
PopularScience_19210801_0099_002_0313.xml
article
109
109
PRACTICAL WORKERS
[no value]
Catch and Collect the Dew in a Pond
[no value]
[no value]
[no value]
E. A. McCANN
[no value]
PopularScience_19210801_0099_002_0314.xml
article
109
109
PRACTICAL WORKERS
[no value]
Children Will Appreciate This Parlor Trick
[no value]
[no value]
[no value]
J. B. MORAN
[no value]
PopularScience_19210801_0099_002_0315.xml
advertisement
109
109
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0316.xml
advertisement
110
110
[no value]
[no value]
The OSTER Manufacturing Company: Speedier Pipe-Threading
[no value]
The OSTER Manufacturing Company
Speedier Pipe-Threading
[no value]
[no value]
PopularScience_19210801_0099_002_0317.xml
advertisement
110
110
[no value]
[no value]
OTTAWA MFG. CO.
[no value]
OTTAWA MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0318.xml
advertisement
110
110
[no value]
[no value]
THE LUFKIN RULE CO.: SPRING JOINT RULES
[no value]
THE LUFKIN RULE CO.
SPRING JOINT RULES
[no value]
[no value]
PopularScience_19210801_0099_002_0319.xml
advertisement
110
110
[no value]
[no value]
Union Tool Chest Co.
[no value]
Union Tool Chest Co.
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0320.xml
article
110
110
PRACTICAL WORKERS
[no value]
Barrel Silo Preserves Feed for Poultry
[no value]
[no value]
[no value]
[no value]
SUPPLYING green feed for laying fowls in winter has always been more or less of a problem with poultry-raisers. The practice of gathering greens during the open season and drying them for winter use has been successful, and is recommended as a good poultry procedure.
PopularScience_19210801_0099_002_0321.xml
article
110
110
PRACTICAL WORKERS
[no value]
Thread-Cutting Can Be Done without a Die
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0322.xml
article
110
110
PRACTICAL WORKERS
[no value]
Improvise a Razor-Strop from a Newspaper
[no value]
[no value]
[no value]
GEORGE H. HOLDEN
FOLD a newspaper several times into a long thin pad, and you will have a good emergency razor-strop that cost nothing. When the paper is folded to the size of a leather strop, attach a strong paper-clip to one end so that it may be hung from a nail or hook.
PopularScience_19210801_0099_002_0323.xml
article
111
111
PRACTICAL WORKERS
[no value]
Matchbox-Holder from a Block of Wood
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0324.xml
article
111
111
PRACTICAL WORKERS
[no value]
Several Methods of Stopping a Crack
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0325.xml
advertisement
111
111
[no value]
[no value]
J. H. Williams & Co.
[no value]
J. H. Williams & Co.
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0326.xml
advertisement
111
111
[no value]
[no value]
FINLAY ENGINEERING COLLEGE
[no value]
FINLAY ENGINEERING COLLEGE
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0327.xml
advertisement
111
111
[no value]
[no value]
The Pilliod Lumber Co.: Pilliod TOOL CASES
[no value]
The Pilliod Lumber Co.
Pilliod TOOL CASES
[no value]
[no value]
PopularScience_19210801_0099_002_0328.xml
advertisement
111
111
[no value]
[no value]
SOUTH BEND LATHE WORKS
[no value]
SOUTH BEND LATHE WORKS
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0329.xml
advertisement
112
112
[no value]
[no value]
RADIUM LUMINOUS MATERIAL CORPORATION: Undark
[no value]
RADIUM LUMINOUS MATERIAL CORPORATION
Undark
[no value]
[no value]
PopularScience_19210801_0099_002_0330.xml
article
112
112
PRACTICAL WORKERS
[no value]
A Tool that Will Remove Clinched Nails
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0331.xml
article
112
112
PRACTICAL WORKERS
[no value]
Would You Like a Pointless Letter-Opener?
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0332.xml
article
112
112
PRACTICAL WORKERS
[no value]
Construct a Towel-Rack for the Kitchen
[no value]
[no value]
[no value]
ARTHUR GOLDENBAUM
[no value]
PopularScience_19210801_0099_002_0333.xml
advertisement
113
113
[no value]
[no value]
MICHIGAN STATE AUTO SCHOOL
[no value]
MICHIGAN STATE AUTO SCHOOL
[no value]
[no value]
[no value]
PopularScience_19210801_0099_002_0334.xml
advertisement
114
114
[no value]
[no value]
Liggett & Myers Tobacco Co.: Fatima
[no value]
Liggett & Myers Tobacco Co.
Fatima
[no value]
[no value]
PopularScience_19210801_0099_002_0335.xml