Issue: 19420201

Sunday, February 1, 1942
FEB. 1942
2
True
140
Thursday, December 25, 2014

Articles
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POPULAR SCIENCE MONTHLY
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PopularScience_19420201_0140_002_0001.xml
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0_2,1
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D. Van Nostrand Company, Inc.
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D. Van Nostrand Company, Inc.
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PopularScience_19420201_0140_002_0002.xml
tableOfContents
2
2,4,6
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CONTENTS for FEBRUARY, 1942
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PopularScience_19420201_0140_002_0003.xml
masthead
2
2
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POPULAR SCIENCE MONTHLY
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PopularScience_19420201_0140_002_0004.xml
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2
2
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Advertisement
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PopularScience_19420201_0140_002_0005.xml
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3
3
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INTERNATIONAL CORRESPONDENCE SCHOOLS
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INTERNATIONAL CORRESPONDENCE SCHOOLS
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PopularScience_19420201_0140_002_0006.xml
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5
5
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LaSalle Extension University
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LaSalle Extension University
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PopularScience_19420201_0140_002_0007.xml
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6
6
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Advertisement
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PopularScience_19420201_0140_002_0008.xml
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7
7
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AMERICAN SCHOOL
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AMERICAN SCHOOL
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PopularScience_19420201_0140_002_0009.xml
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8
8
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The Rosicrucians
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The Rosicrucians
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PopularScience_19420201_0140_002_0010.xml
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9
9
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HALDEMAN-JULIUS CO.
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HALDEMAN-JULIUS CO.
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PopularScience_19420201_0140_002_0011.xml
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10
10,11
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J. E. SMITH
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J. E. SMITH
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PopularScience_19420201_0140_002_0012.xml
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12
12
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Advertisement
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PopularScience_19420201_0140_002_0013.xml
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13
13
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H. C. LEWIS
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H. C. LEWIS
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PopularScience_19420201_0140_002_0014.xml
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14
14,15
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CLARENCE A. O'BRIEN
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CLARENCE A. O'BRIEN
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PopularScience_19420201_0140_002_0015.xml
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14
14
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McKinley-Roosevelt Incorporated
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McKinley-Roosevelt Incorporated
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PopularScience_19420201_0140_002_0016.xml
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14
14
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METAL CAST PRODUCTS CO.
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METAL CAST PRODUCTS CO.
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PopularScience_19420201_0140_002_0017.xml
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14
14
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BROOKLYN YMCA TRADE SCHOOL
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BROOKLYN YMCA TRADE SCHOOL
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PopularScience_19420201_0140_002_0018.xml
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15
15
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Thurston Supply Company
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Thurston Supply Company
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PopularScience_19420201_0140_002_0019.xml
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15
15
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TRI-STATE COLLEGE
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TRI-STATE COLLEGE
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PopularScience_19420201_0140_002_0020.xml
article
16
16,18
Readers Say:
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Readers Say:
Mysterious Chemical Reaction on a Linotype Machine
That Time Our Proofreader Flunked the Question Bee
Some Skunks Do, Some Don't Seems to Be the Answer
He Won't Let Us Let Him Let Us Stop Sending P.S.M.
That Wasn't A Projectionist —That Was an Operator
Gus Says: That Sign Is Meant for the Customers Only
Fireplace from P.S.M. Plans Warms Jungle Nights
P.S.M. Is Money in His Pocket and Knowledge in His Head
Here's the Dope on Keeping Your Fishing Worms Alive
He Caught One of Those Tricks in a Western Thriller
Diophantus Would Have Died Figuring This One Out
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HERE’S a problem for the know-alls to solve. Being a linotype operator, I decided the other day to print some identification slips to paste on the steel covers of the magazines that hold the mats—brass pieces on which the letters are molded in a linotype machine.
PopularScience_19420201_0140_002_0021.xml
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17
17
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ACADEMY OF AERONAUTICS
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ACADEMY OF AERONAUTICS
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PopularScience_19420201_0140_002_0022.xml
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19
19
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DYNAMIC WELDER CO.
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DYNAMIC WELDER CO.
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PopularScience_19420201_0140_002_0023.xml
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20
20
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G. & C. Merriam Co.
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G. & C. Merriam Co.
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PopularScience_19420201_0140_002_0024.xml
article
20
20
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Coming Next Month—
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EYES OF THE ARMY is the air observer. From a fast plane high above the enemy’s lines he takes pictures to spot artillery positions and detect troop movements and concentrations. Quick developing in mobile darkrooms puts his photos in the hands of commanders in a jiffy.
PopularScience_19420201_0140_002_0025.xml
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21
21
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POSTAL LIFE & CASUALTY INSURANCE CO.
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POSTAL LIFE & CASUALTY INSURANCE CO.
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PopularScience_19420201_0140_002_0026.xml
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22
22
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Advertisements
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PopularScience_19420201_0140_002_0027.xml
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23
23
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CHARLES ATLAS
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CHARLES ATLAS
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PopularScience_19420201_0140_002_0028.xml
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24
24
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Advertisements
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PopularScience_19420201_0140_002_0029.xml
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25
25
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MIDWEST RADIO CORPORATION
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MIDWEST RADIO CORPORATION
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PopularScience_19420201_0140_002_0030.xml
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26
26
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Advertisements
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PopularScience_19420201_0140_002_0031.xml
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27
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PopularScience_19420201_0140_002_0032.xml
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28
28
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PopularScience_19420201_0140_002_0033.xml
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29
29
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PopularScience_19420201_0140_002_0034.xml
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30
30
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PopularScience_19420201_0140_002_0035.xml
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31
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PopularScience_19420201_0140_002_0036.xml
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32
32
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Advertisements
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PopularScience_19420201_0140_002_0037.xml
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33
33
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MASTER GLAZE CO.
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MASTER GLAZE CO.
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PopularScience_19420201_0140_002_0038.xml
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33
33
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GIBSON, INC.
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GIBSON, INC.
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PopularScience_19420201_0140_002_0039.xml
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33
33
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American School
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American School
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PopularScience_19420201_0140_002_0040.xml
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33
33
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SPRAYBERRY ACADEMY OF RADIO
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SPRAYBERRY ACADEMY OF RADIO
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PopularScience_19420201_0140_002_0041.xml
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34
34
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Advertisements
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PopularScience_19420201_0140_002_0042.xml
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35
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Advertisements
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PopularScience_19420201_0140_002_0043.xml
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36
36
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Institute of Mentalphysics
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Institute of Mentalphysics
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PopularScience_19420201_0140_002_0044.xml
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37
37,38,39,40,41,42,43,44
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POPULAR SCIENCE Classified OPPORTUNITIES
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PopularScience_19420201_0140_002_0045.xml
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45
45
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Advertisements
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PopularScience_19420201_0140_002_0046.xml
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46
46
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PopularScience_19420201_0140_002_0047.xml
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PopularScience_19420201_0140_002_0048.xml
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48
48
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INTERNATIONAL CORRESPONDENCE SCHOOLS
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INTERNATIONAL CORRESPONDENCE SCHOOLS
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PopularScience_19420201_0140_002_0049.xml
article
49
49,50,51
News
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Supersounds
WONDER-WORKING VIBRATIONS MAKE FOOD BETTER AND METALS STRONGER
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KENNETH M. SWEZEY
SOUND WAVES too powerful for the human system to bear, and others too high in pitch for the human ear to hear, are new miracle-working tools in science and industry. In dozens of laboratories, scientists are perfecting sound-generating devices, and discovering new uses for supersound and ultrasound.
PopularScience_19420201_0140_002_0050.xml
article
52
52,53,54,55,56,57,220,222
News
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Testing the Hot Ships
With more and more speed being built into fighting planes, "pilots with a knack" are needed to master them. The Army test pilot is a man with many jobs.
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HICKMAN POWELL
EVERY now and then in the Army Air Corps there turns up a young pilot who has a special knack with airplanes. As his talent is recognized, word gets around that here is a sweet flyer. Often the same fellow has an equally outstanding love for flying, which, after five, six, or seven years, may be statistically demonstrated.
PopularScience_19420201_0140_002_0051.xml
article
58
58
Inventions
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STEEL PILLBOX IS ASSEMBLED IN 1½ HOURS
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A PORTABLE steel pillbox six feet square has recently been developed for the Army by Lt. Col. R. B. Lord. It consists of 14 basic plates that may be bolted together on location in one and one half hours after the hole has been dug to place it in. The new pillbox stands 20 inches above the ground and has sliding ports on all four sides which give a 360-degree field of fire for 37-mm. guns or machine guns.
PopularScience_19420201_0140_002_0052.xml
article
59
59,60,61,62,63,224,226
News
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The METAL THAT NEVER TIRES
BERYLLIUM FINDS WIDE USE IN THE AUTOMATIC CONTROLS THAT RUN MODERN MACHINERY
HOW BERYLLIUM IS EXTRACTED AND ALLOYED TO FORM A WONDER METAL
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ALFRED H. SINKS
CHANCES are that you have never seen any beryllium, yet you probably have some occasion to use it every day. You take the jobs it does for granted, but they make a big difference in your comfort, safety, and pocketbook. Because of beryllium your new vacuum cleaner will last four to five times as long as the old one.
PopularScience_19420201_0140_002_0053.xml
article
64
64,65,66,67
News
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War Teaches Us To Fight Fires
Methods and Equipment Born of the Emergency Have Permanent Value
How to Put Out a Fire Bomb
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A LENGTH of garden hose, with a spray nozzle on one end and a stirrup pump on the other, has become one of England’s chief defense weapons. And out of this and more complex devices, designed for protection against fire from the sky, has grown in the United States a vast civilian army of trained fire fighters, with new equipment never dreamed of until the war emergency forced invention upon us.
PopularScience_19420201_0140_002_0054.xml
article
68
68,69,70,71
News
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Animal Magicians
A $60,000 Horse, and Rabbits on a Modern Laboratory Farm Help Produce Precious Serum That Saves Many Human Lives
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SIX HUNDRED well-fed horses, on one New York farm, watch tractors do all the work. Their business is not plowing or pulling wagons. It is saving lives. In common with thousands of other animal heroes in all parts of the United States, these horses produce, through the chemical magic of their bodies, life-saving serum.
PopularScience_19420201_0140_002_0055.xml
article
72
72
Facts and Ideas
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U. S. Soldiers "Tagged” for Blood Transfusion
A Simple Test Quickly Determines Each Man's Blood Group
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PRECIOUS time will be saved in giving blood transfusions to soldiers in the U. S. Army because each man’s blood group will be stamped on his identification tag. With a new testing technique, it takes a technician only a few minutes to group the blood.
PopularScience_19420201_0140_002_0056.xml
article
72A
72A,72B,72C,72D,72E,72F,72G,72H,73,74
News
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FOR THE DEFENSE OF— America Attacked
What Brave New Weapons Gird Our Fighting Men? Carl Dreher Reveals How Embattled Industry Met The Challenge of Axis Threats to Our Freedom
HOW THE NAVIES LINE UP
MODERN WARPLANES ARE COMPLEX MACHINES
AMERICA’S AIRACOBRA AS USED MODEL MAINLY IN THE USE OF A BY THE BRITISH DIFFERS FROM OUR OWN 20-MM INSTEAD OF A 37-MM NOSE CANNON
LEGEND
Triple Threat to Dive Bombers
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A “NEW” weapon is never altogether new. Generally speaking, it is just an improved machine for killing enemy personnel and destroying enemy equipment. There is always the possibility of hitting on something spectacular and unprecedented, but Superman is a character in a comic strip and there are no supermen in the actual world of designing and operating fighting machines.
PopularScience_19420201_0140_002_0057.xml
article
75
75,76,77,78,79,80
News
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When bombers attack
HOME PROTECTION IS IMPORTANT TO AMERICAN DEFENSE-HERE ARE THINGS YOU SHOULD KNOW
EQUIPMENT FOR REFUGE ROOM
HOW TO PROTECT WINDOWS FROM BLASTS
HOW TO BUILD AN OUTDOOR SHELTER
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"WHAT should I do in case of an air raid?” To millions of Americans on both coasts, wailing sirens have brought home that question. The cool-headed civilian who knows all the answers, and acts promptly upon them, serves both himself and his country.
PopularScience_19420201_0140_002_0058.xml
article
81
81
Facts and Ideas
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Train Is Converted into Model Farm for Demonstration Tour
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BRINGING pure-bred cattle, hogs, and poultry almost into the front yard, the Clemson College Livestock and Better Farm Living Train, an eight-car farm special, toured South Carolina recently, demonstrating the economics of agriculture from a standpoint of national defense to almost 75,000 persons.
PopularScience_19420201_0140_002_0059.xml
article
82
82,83,84,85,86,87,88,89
News
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HOW AMERICA HAS DEVELOPED HER Sky Destroyers
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CARL DREHER
THERE IS NOTHING STATIC about military aviation in any of its phases. It is always doing things in a new way, and almost before one’s eyes the new ways become old. But the pace of change is swiftest in that branch least known to the public: air support.
PopularScience_19420201_0140_002_0060.xml
article
90
90,91,92,93,94,95
HOW IT IS DONE
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RUBY CUTTING
America Takes Over an Ancient Art . . .
SKILLED HANDS UNCOVER BEAUTY OF GEMS THAT ARE MORE PRECIOUS THAN DIAMONDS
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CONTRARY to popular belief, rubies, not diamonds, are the most precious of all jewels. And today, fashion, taste, and fortune have made Americans the world's best customers for rubies while the war has made the United States the greatest Western cutting center for them.
PopularScience_19420201_0140_002_0061.xml
article
96
96
Inventions
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New Tools
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AUXILIARY WORK TABLE. Providing an extra large, true working surface to insure greater ease of operation and added accuracy, this steel-top table is made of heavy-gauge steel bonded to a plywood base. It may be used as a guide in surface grinding, sanding, drilling, routing, paneling, rabbeting, and tenoning work.
PopularScience_19420201_0140_002_0062.xml
article
97
97
Un-Natural History
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Un-Natural History
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Gus Mager
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PopularScience_19420201_0140_002_0063.xml
article
98
98,99,100,101
News
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Policing a Nation at War
J. Edgar Hoover, in an Exclusive Interview, Tells of Plans to Meet the Threat of Raid or Invasion
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ARTHUR GRAHAME
"SHOULD invaders ever set foot on our shores, whether they come by water or by air, there won’t be any blackout of protection for civilians in America!” When that determined statement is made by J. Edgar Hoover, the forceful director of the Federal Bureau of Investigation, you know that there is a lot more than wishful thinking behind his words.
PopularScience_19420201_0140_002_0064.xml
article
102
102,103
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Helping Flyers Make the Grade
Just a little something is wrong with 10% of the young men who want to fly for the U.S. But they can be fixed up— and here's how it's being done
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WHEN the Navy calls, as it did not long ago, for 25,000 young men to fly its fighters and bombers, it takes 250,000 applicants to make up the quota. Only 20 men in a hundred are accepted for the United States air services, and of that 20, ten are dropped for minor physical or educational handicaps in the grind of training.
PopularScience_19420201_0140_002_0065.xml
article
104
104,105,106,107,108,109
HOW IT IS DONE
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Beating Forests Into Paper
INGENIOUS MACHINES TURN PULPWOOD LOGS INTO MAGAZINE PAGES
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PAPER makes headlines today. Consumption leaps as the Army uses it to wrap shells, and to package tinned food. Waste paper is solicited, to be turned into new. Chlorine gas, used both in munitions and in bleaching paper, must be conserved. But how many people can tell how paper is made?
PopularScience_19420201_0140_002_0066.xml
article
110
110
Facts and Ideas
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High-Speed Boring Guided by Amplified Sound Instead of Sight
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AN “ELECTRIC ear" guides the operator of a high-speed machine for boring in hardened steel holes of a diameter down to twenty thousandths of an inch. The tiny grinding quill is driven by an air spindle at speeds as high as 75,000 revolutions a minute—too fast to be followed by eye.
PopularScience_19420201_0140_002_0067.xml
article
110
110
Facts and Ideas
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New Electron Microscope Reveals Insect Structure
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WHAT the gossamer fabric of a butterfly’s wing looks like, when magnified thousands of times, is shown at right. A small part of just one of the tiny colored scales that overlie the wings like shingles covers this section, pictured with a super-powerful RCA electron microscope.
PopularScience_19420201_0140_002_0068.xml
article
111
111
Aviation
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"Cold Room" Tests Men and Materials for High Flying
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TO TEST the effects of extreme cold on high-flying planes and aviators, engineers of the Douglas Aircraft Company, at Santa Monica, Calif., have constructed a “cold room” in which they are able to subject men and materials to temperatures as low as 104 degrees below zero.
PopularScience_19420201_0140_002_0069.xml
article
112
112,113
Here's My Story
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Here's My Story
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DAVID R. DAVIS
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PopularScience_19420201_0140_002_0070.xml
article
114
114,115,116,117,118,119
HOW IT IS DONE
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Secrets of the Flight Archers
SHOOTING FOR DISTANCE WITH A BOW AND ARROW IS A SCIENTIFIC SPORT
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WHEN a flight archer pulls his heavy bow and sends an arrow on its way he has little interest in bull’s-eyes. It is yards, not points, that he is after. He is one of the Babe Ruths and Joe DiMaggios of the archery game; he is out to “slam it over the fence” and the farther it goes the better he likes it.
PopularScience_19420201_0140_002_0071.xml
article
120
120
Aviation
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Movable Platform Employed in Cleaning Airliners
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UNITED Airlines engineers have designed an adjustable, mobile stand on which mechanics can reach any external part of an airplane. It consists of two caster-mounted upright sections of steel tubing, each 12 feet high, and an aluminum platform, 25 feet long and 20 inches wide, which the mechanics can raise, lower, or tilt to an angle of 20 degrees without descending.
PopularScience_19420201_0140_002_0072.xml
article
120
120
Facts and Ideas
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Moistureproof Bags Made for Small Machine Parts
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CELLOPHANE packages, now being made for manufacturers of small machine parts, have on their face a series of white panels printed in a special ink which will take pencil or hand-stamped identification marks. The packaged product also can be seen easily through the transparent material.
PopularScience_19420201_0140_002_0073.xml
article
121
121
Automobiles
[no value]
ROLLING HEADQUARTERS
DIRECTS ARMY IN THE FIELD
[no value]
[no value]
[no value]
FOUR motor trailers, now serving as advance field headquarters for the U. S. Third Army, give a general no soft post far from the battle front. Instead, they may be whisked in a jiffy wherever tactical needs demand. In the woods, cut boughs camouflage them; among the shanties of a backwoods town, tarpaulins and paint transform them into innocent-looking dwellings or sheds.
PopularScience_19420201_0140_002_0074.xml
article
122
122
Inventions
[no value]
Hydrofluoric Acid Vapor Cuts Glare and Reflection in Glass
[no value]
[no value]
[no value]
[no value]
THE lives of many pilots may be saved by a new chemical process that is said to eliminate virtually all troublesome reflections on the glass used on airplane instruments, where an error in reading may mean the smashing of the ship. The process, developed by Dr. F. H. Nicoll, research scientist of the RCA Laboratories, is also reported to wipe out the glare and reflections and improve the clarity of glass used in show windows, camera screens and lenses, and picture frames.
PopularScience_19420201_0140_002_0075.xml
article
122
122
Aviation
[no value]
Threaded Tube Set as Rivet Speeds Fastening of Plane Fittings
[no value]
[no value]
[no value]
[no value]
A CROSS between a rivet and a nut is used to speed blind riveting of fittings on airplanes. It is a flanged tube with a threaded hole part or all the way through the stem, and is set into a hole by a heading tool which raises a bulge to prevent it from being withdrawn.
PopularScience_19420201_0140_002_0076.xml
article
123
123
[no value]
[no value]
Paratroops Ride on Bicycles and Eat Compact Rations
[no value]
[no value]
[no value]
[no value]
THE sight of soldiers descending from the skies in parachutes is startling enough to most Americans, but they would be even more surprised to see these paratroops mount bicycles which floated down with them and ride away. The Marine Corps has been equipping its paratroops with bicycles that fold up.
PopularScience_19420201_0140_002_0077.xml
article
123
123
[no value]
[no value]
Neat Chemical Tray Is Made of Block, Plywood, and Dowels
[no value]
[no value]
[no value]
[no value]
A HOMEMADE chemical kit which a student can fit into his locker has been designed by W. Gilbert Spangler, head of the Science Department at the Berwyn, Pa., High School. The kit was made from a two-by-four block of wood 12 inches long with a plywood tray in front.
PopularScience_19420201_0140_002_0078.xml
article
124
124
Facts and Ideas
[no value]
Self-Reeling Garden Hose Appears through Bird-House Door
[no value]
[no value]
[no value]
[no value]
TO MAKE his garden hose a less prosaic tool, Luke Johnson of Los Angeles hides it on a self-winding reel inside his garage. When the hose is wanted for watering the lawn, the nozzle is drawn out from an innocent-looking bird house attached to the garage wall.
PopularScience_19420201_0140_002_0079.xml
article
124
124
Inventions
[no value]
Elastic Stop Nut Locks Itself
[no value]
[no value]
[no value]
[no value]
ELASTIC stop nuts, which lock themselves after they have been placed over a bolt, are being used on the new Army 37-mm. antiaircraft gun. They are said to be able to absorb vibration from rapid fire, because their elastic, nonmetal collar molds itself over the threads of any standard-size bolt and then locks.
PopularScience_19420201_0140_002_0080.xml
article
124
124
Inventions
[no value]
New Device Measures Vibration and Speed Just by Touch
[no value]
[no value]
[no value]
[no value]
AN INSTRUMENT to measure by a mere touch the vibration and speed of many types of motors, ranging from airplanes to electric razors, operates with a mechanism of specially “tuned” reeds which vibrate in resonance with the motor—the rate of vibration equaling the speed of a machine.
PopularScience_19420201_0140_002_0081.xml
article
125
125
Facts and Ideas
[no value]
Mobile Heated Booth Keeps Food-Locker Patrons Warm
[no value]
[no value]
[no value]
[no value]
THE woman shown above is taking food from her locker in one of the refrigeration units of the Harmon Frozen Food Locker Company. The temperature in the locker room is at zero Fahrenheit. But the customer is not freezing, because the floorless booth in which she stands has a temperature of 70 degrees—normal for a room.
PopularScience_19420201_0140_002_0082.xml
article
126
126
Facts and Ideas
[no value]
Tin-Can "Camera" Locates Atoms Inside Steel Plate
[no value]
[no value]
[no value]
[no value]
ARTIFICIALLY radioactive substances, already of interest to medicine and biology, now aid the metallurgist. To a small batch of molten steel, Dr. William E. Shoupp, Westinghouse physicist, added phosphorus made ray-emitting, like radium, by exposure to an atom smasher.
PopularScience_19420201_0140_002_0083.xml
article
126
126
Facts and Ideas
[no value]
Milk Bottles and Glasses Get Germproof Rims
[no value]
[no value]
[no value]
[no value]
GERM-KILLING rims for glasses and for milk bottles have been perfected by Dr. Alexander Goetz, physicist, and Dr. Ralph L. Tracy, bacteriologist, of the California Institute of Technology. The coatings are expected to prove of great aid in curbing the spread of communicable disease, since they retain their bactericidal properties for at least two years and probably for the life of the vessel itself.
PopularScience_19420201_0140_002_0084.xml
article
127
127
Facts and Ideas
[no value]
Handling the Hot Lines
[no value]
[no value]
[no value]
[no value]
MECHANICAL FINGERS developed by engineers of the Southern California Edison Company make possible day-by-day maintenance work on high-voltage transmission lines without disrupting service. Workmen replace dead-end insulators and suspension strings, test insulators, patch damaged conductors, and install vibration dampers while 220,000 volts surge through the lines at their finger tips.
PopularScience_19420201_0140_002_0085.xml
article
128
128
Book Review
[no value]
Book Review
[no value]
[no value]
[no value]
[no value]
FOR THE CRAFTSMAN and the professional, “Bent Tubular Furniture” (Bruce Publishing Company) offers clear, concise diagrams and instructions for making 51 pieces of bent tubular furniture. All the articles of furniture listed in the book can be constructed in the home workshop with no extra equipment other than a bending jig.
PopularScience_19420201_0140_002_0086.xml
article
128
128,222
Question Bee
[no value]
Question Bee
[no value]
[no value]
[no value]
[no value]
1 Magnesium is valued because it (a) is highly magnetic (b) resists corrosion (c) melts at an extremely high temperature (d) is the lightest structural metal. 2 We can depend upon an abundant supply of nickel because about 90 percent of it comes from (a) Canada (b) Brazil (c) Cuba (d) Pennsylvania.
PopularScience_19420201_0140_002_0087.xml
article
129
129,130,131,132,133
AUTOS
[no value]
Tire Tips FROM A TEST-CAR DRIVER
How to Get Increased Mileage Out of Your Tires
WHAT YOUR TIRES LOOK LIKE INSIDE
[no value]
[no value]
WALTER E. BURTON
WHAT would you do if some one handed you a set of brand-new tires and the curt order: “Wear ’em out in three days”? There are men who have received such assignments without blinking, and have carried them out to the letter by reducing a set of new tires to scrap in 72 hours of driving—in a mere 2,500 miles on the road.
PopularScience_19420201_0140_002_0088.xml
article
134
134
Automobiles
[no value]
Auto Ideas
[no value]
[no value]
[no value]
[no value]
BRAKE-LINING FACES are ground to a uniformly flat surface without removing them from the car, by means of the electric grinder illustrated at the right. The fact that the grinding is done with the brake shoes in place is said to make possible an accurate adjustment of the brakes when the drums are replaced.
PopularScience_19420201_0140_002_0089.xml
article
135
135,136,137,138
Automobiles
[no value]
What Do You Know About Highway Signs?
TYPICAL STANDARDIZED HIGHWAY SIGNS OF THE SPREADING
HAND SIGNALS FOR DRIVERS
EVERY DRIVER SHOULD KNOW THESE UNIFORM SIGN SHAPES
REGULATORY
WARNING
GUIDE
NATIONAL UNIFORM SYSTEM
[no value]
[no value]
SCHUYLER VAN DUYNE
DO YOU KNOW what the seven signs above mean? They're all road signs, and as the driver of an automobile, a truck, a bus, or a motorcycle, you should be able to recognize them instantly by their shapes alone. They comprise the highway shorthand of the road, a simple symbol language that can be learned in a few minutes.
PopularScience_19420201_0140_002_0090.xml
article
139
139
Automobiles
[no value]
Auto Ideas
[no value]
[no value]
[no value]
[no value]
A LIGHTWEIGHT IMPACT WRENCH ideal for loosening “frozen” wheel lugs or nuts makes a handy garage or service-station tool. Weighing but 8½ pounds, the device is made of aluminum alloy wherever the mechanism permits. Its design localizes the steel-to-steel impact without transmitting shock to other parts of the tool and to the operators’ hands.
PopularScience_19420201_0140_002_0091.xml
article
140
140,141
Automobiles
[no value]
IDEAS TO MAKE YOUR DRIVING PLEASANTER
[no value]
[no value]
[no value]
[no value]
1 A DISTINCTIVE CAR MARKER that will instantly identify your parked car no matter how many others are parked in the same lot or field, can be made as shown for attaching to the top of your radio antenna on leaving the car. Because of its reverse curve, a breeze will set it spinning to pick up light reflections at night and make it more noticeable by day.
PopularScience_19420201_0140_002_0092.xml
article
142
142,143,144,218
Automobiles
[no value]
GUS drives a bargain
Trooper Corcoran May Know His Cars. But the Model Garage Proprietor Knows His Cars and His Salesmen, Too. It's Important Sometimes!
[no value]
[no value]
MARTIN BUNN
"HEY, Jerry, what the heck’s the matter with you today, anyhow?” Gus Wilson demanded. “You’ve been sitting there on the end of that workbench for the better part of half an hour without saying ten words.” Trooper Jerry Corcoran, of the State Police, slowly lit a cigarette.
PopularScience_19420201_0140_002_0093.xml
article
145
145,146,147,148,149
HOME and WORKSHOP
[no value]
Games ...WHEREVER AND WHENEVER YOU WANT TO PLAY THEM
For men in service and industrial workers away from home, this simply made portable game kit provides endless recreation
A PORTABLE KIT DESIGNED ESPECIALLY FOR MEN IN SERVICE, BUT EQUALLY GOOD FOR CIVILIANS
[no value]
[no value]
Charles
Bertram Brownold
MEN in Army camps and civilians working under high pressure in defense industries stand in great need of adequate recreation. They must have their games. It is, fortunately, quite easy to provide facilities for a number of games by constructing the type of combination playing board and game kit illustrated.
PopularScience_19420201_0140_002_0094.xml
article
150
150,151
[no value]
[no value]
KEEPING THE HOME SHIPSHAPE
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0095.xml
article
152
152,153,154,155,156
Woodworking
[no value]
A Royal Hobby
EDWIN M. LOVE TAKES YOU STEP BY STEP THROUGH THE ELEMENTS OF WOOD TURNING
What is the first step in spindle turning?
What is the action of lathe tools?
POINTERS ON SPINDLE TURNING
How is turning begun?
What is the next step after rough-turning?
What are the steps in cutting a bead?
How are coves or concave cuts made?
Can beads and coves be formed by scraping?
Are any extra precautions necessary in cutting tapers?
How are the ends of the work squared?
How is work cut off?
[no value]
[no value]
[no value]
THE magic of motion and keenedged steel shapes a whirling block of wood as easily as the potter’s thumb molds clay. Turning, one of the oldest woodworking arts, has been the hobby of kings, and remains today a popular type of craftwork. More than any other power tool, the lathe is in itself capable of producing finished pieces.
PopularScience_19420201_0140_002_0096.xml
article
157
157
Home Building
[no value]
Automatic Humidifier Installed in Hot-Air Furnace System
[no value]
[no value]
[no value]
C. E. LIMBERG
EXCESSIVE dryness in a house heated by a hot-air furnace can be avoided by the installation of an automatic humidifier on top of the fire pot. Remove one of the hot air pipes temporarily, and through the opening lay a concave-faced fire brick, with the concave face up, on small stones or pieces of metal to allow circulation between the bottom of the brick and the top of the fire pot.
PopularScience_19420201_0140_002_0097.xml
article
157
157
[no value]
[no value]
Old Crêpe-Rubber Soles Turned into Satisfactory Cement
[no value]
[no value]
[no value]
DAVID SCHUCHMAN
QUICK-DRYING rubber cement for mounting photographic prints and other paper-cementing jobs can be made from old crêperubber soles. Clean the rubber thoroughly with soap and water, let it dry, then wipe with benzine or gasoline. Cut the sole into small pieces and throw these into a jar or bottle containing benzol (use the technical grade) in the proportions of about 1½ oz. rubber to 1 qt. of benzol. Set this aside for a few days.
PopularScience_19420201_0140_002_0098.xml
article
158
158,159
Craftwork
[no value]
Craftwork for Merrymaking
TWO PROJECTS PREPARED ESPECIALLY FOR POPULAR SCIENCE
[no value]
[no value]
ERNEST R. DEWALT
JOLLY-FOURSOME STEIN SET. Tall glasses, obtainable at the five-and-ten, can be converted into a handsome beverage set by the addition of wooden covers and handles. This makes an ideal accessory for the owner of a basement bar, although the glasses are suitable for all-around home service, especially if they are used with the matching tray described on the facing page.
PopularScience_19420201_0140_002_0099.xml
article
160
160,161
Craftwork
[no value]
How to Prepare Your Own "Decal" Transfers
[no value]
[no value]
[no value]
VERNON B. CASE
SPECIAL decalcomania designs, or “decals” as they are called, are easy to make for use in decorating furniture, china, trays, holiday windows, and doing a host of things that are difficult by other methods. The special, coated paper that is required can be purchased at some art stores for about 20 cents for a 25" by 36" sheet, but usually no less than six sheets will be sold.
PopularScience_19420201_0140_002_0100.xml
article
162
162
The Handy Man
[no value]
Rack Holds Venetian-Blind Slats While They Are Repainted
[no value]
[no value]
[no value]
MAURICE B. DENNISON
VENETIAN blinds may be repainted quickly and perfectly by taking them apart and holding the slats in a rack made as shown. If the slats are spaced correctly on both sides of the rack, it is possible to spray in one operation both the underside of a slat on the far side of the rack and the top of a slat on the near side.
PopularScience_19420201_0140_002_0101.xml
article
163
163
Woodworking
[no value]
Compact Home Workshop Built in End of Attached Garage
[no value]
[no value]
[no value]
[no value]
FINDING a place for the home workshop is often a problem in small, modern homes, especially when the basement contains a finished playroom as well as the usual furnace and laundry equipment. One solution, if there is an attached garage, is to use the end of the garage as a shop.
PopularScience_19420201_0140_002_0102.xml
article
164
164,165
Home Building
[no value]
Illuminated House Number
[no value]
[no value]
[no value]
WALTER E. BURTON
BY THE method shown in the accompanying wiring diagram, a doorbell circuit can be used to operate a house-number and utility light for practically nothing. One or two lamps are connected across the doorbell button. These burn at a brilliancy lower than normal, consuming almost no current, but give enough light to make them useful.
PopularScience_19420201_0140_002_0103.xml
article
165
165
Shop Data File
[no value]
ELECTROPLATING, PART 8
[no value]
[no value]
[no value]
[no value]
When the surface of degreased and chemically cleaned work appears tarnished or coated with an oxide film, it should be treated in a pickling solution to avoid peeling of the plating. Iron or steel. Either (a) 8 oz. of sulphuric acid to 1 gal. of water, or (b) equal parts of muriatic acid and water.
PopularScience_19420201_0140_002_0104.xml
article
166
166,167
Miscellaneous
[no value]
IDEAS for HOME OWNERS
[no value]
[no value]
[no value]
[no value]
FOR COVERING SMALL SURFACE NICKS on furniture or imparting a new finish when polish and wax will no longer brighten old pieces, a synthetic resin sealer and primer will be found helpful. Applied with a saturated rag over the old finish, it will dry in ordinary room temperature in about four hours, providing a hard surface which is resistant to water and alcohol.
PopularScience_19420201_0140_002_0105.xml
article
168
168
New Shop Ideas
[no value]
Drill Holder with Large Capacity Bent from Strip of Lead
[no value]
[no value]
[no value]
B. N.
MADE in a jiffy, this handy rack holds a large number of drills in compact form, and is heavy enough not to be upset easily. A tapering strip of sheet lead is used, and all the bending can be done by hand directly over the drills themselves, although a pair of round-nose pliers may be found a convenience for making the smaller bends.
PopularScience_19420201_0140_002_0106.xml
article
168
168
[no value]
[no value]
ACME THREAD GAUGE
[no value]
[no value]
[no value]
[no value]
Grind the Acme-thread bit on a machine if possible, checking it during the process with the Acme thread gauge. The 29-deg. V-notch at the end of the gauge is used for testing the angular sides of the tool. Use the shallow notches for checking the width of the cutting edge at the nose.
PopularScience_19420201_0140_002_0107.xml
article
169
169
New Shop Ideas
[no value]
How to Machine Special Washers Accurately in a Lathe
[no value]
[no value]
[no value]
WILLIAM J. HARGEST
SPECIAL washers of fiber, brass, iron, and other ferrous and nonferrous material can be made quickly and inexpensively in the lathe. Prepare a faceplate, marked A in the drawing, 5" in diameter, and scribe on it eight radial lines 45-deg. apart.
PopularScience_19420201_0140_002_0108.xml
article
169
169
New Shop Ideas
[no value]
Small Jars in Stand Hold Drill Lubricants
[no value]
[no value]
[no value]
J. M.
SMALL amounts of the various drill lubricants, such as lard oil, kerosene, turpentine, and soap mixtures, that are needed for drilling certain kinds of metal, can be kept ready for use in a set of small cosmetic jars. Cap the jars to prevent the lubricants from evaporating or otherwise becoming unfit for use.
PopularScience_19420201_0140_002_0109.xml
article
170
170
Shop Data File
[no value]
MASKING IN SPRAY PAINTING, PART 1
MASKING IN SPRAY PAINTING, PART 2
[no value]
[no value]
[no value]
Masks of adhesive paper or cloth tape will protect areas not to be covered when a spray gun is used for painting. The tape comes in a number of widths, but for the ordinary shop, ½" to 1" is most useful. On small areas, such as chromium or stainless-steel automobile trim, use the tape alone.
PopularScience_19420201_0140_002_0110.xml
article
171
171
New Shop Ideas
[no value]
Heavy-Duty Vise for Drill Press Built from Scrap Steel
[no value]
[no value]
[no value]
[no value]
FOR holding fairly large work or for heavy drilling, a strong vise may be built from short ends of cold-rolled steel and other waste stock as illustrated. The slide rods and vise screw are turned from ⅞" rod, and the slide-rod threads are cut on the lathe to insure accuracy.
PopularScience_19420201_0140_002_0111.xml
article
172
172,173
MACHINISTS FOR DEFENSE
[no value]
Bell Centering Punch: A Project for Machine-Shop Beginners
[no value]
[no value]
[no value]
[no value]
IT IS difficult to center-punch work by hand with hair-line accuracy, as the slightest inclination of the punch will shift the mark to one side. With a bell centering holder, such as shown in Fig. 1, however, the punch is held absolutely vertical, and a clean, accurate mark results.
PopularScience_19420201_0140_002_0112.xml
article
173
173
MACHINISTS FOR DEFENSE
[no value]
This Sturdy Knurl Holder Is Useful in the Machinist's Kit
[no value]
[no value]
[no value]
[no value]
KNURLING in the lathe, both straight and diamond, imparts a fine, finished appearance to small work, such as tool handles, thumb screws, and so on. A holder for the knurling tool, like that shown in Fig. 1, is easily made, and will help to simplify the job of knurling.
PopularScience_19420201_0140_002_0113.xml
article
174
174,175
New Shop Ideas
[no value]
Extension Tool Holder for Small Shaper
CUTS INTERNAL KEYWAYS AND SPLINES
[no value]
[no value]
C. W. WOODSON
THE practical extension tool holder illustrated in Fig. 1 enables a small shaper to cut splines and keyways and do other internal work. With the exception of cutting a hole for the tool bit, all operations in making it are performed in the lathe.
PopularScience_19420201_0140_002_0114.xml
article
176
176,177
Miscellaneous
[no value]
New Appliances for the Household
[no value]
[no value]
[no value]
[no value]
PLASTIC STRIPS for replacing aluminum trim on sinks, shelves, and tables come in a variety of colors with a contrasting insert. The edging has a noncorrosive, washable finish that will resist chipping and peeling. It is made in several shapes and sizes, and inserts may be bought separately to suit individual color schemes
PopularScience_19420201_0140_002_0115.xml
article
178
178
Craftwork
[no value]
Shaving-Soap Bowl and Brush Holder
[no value]
[no value]
[no value]
[no value]
MEMBERS of the brush-and-lather school of shaving will welcome this soap and brush holder. Made of maple, it is an interesting but not difficult turning project. The brush standard is designed for a stock-size professional brush having bristles 2" long.
PopularScience_19420201_0140_002_0116.xml
article
179
179,180,181,182,183
Home and Workshop
[no value]
Improve Your Home...NOW
What You Can Do to Repair and Modernize Your Home
[no value]
[no value]
CARL T. SIGMAN
WILLIAM J. WARD
IN TIMES past, when part of the plumbing went bad or you needed a new kitchen range or wished to install a new shower, you went to a hardware store or plumbers’ supply house and bought what you wanted. But defense needs are rapidly altering the circumstances under which we live.
PopularScience_19420201_0140_002_0117.xml
article
184
184
Craftwork
[no value]
Place Cards
[no value]
[no value]
[no value]
[no value]
FOR VALENTINE PARTIES, you can make amusing place-card favors from rolls of candy mint rings. Remove the paper, but not the tin foil. Cut the head from red paper, glue on mints for eyes, a candy heart for the mouth, and cement to the mint roll.
PopularScience_19420201_0140_002_0118.xml
article
184
184
Shop Data File
[no value]
CEMENTING, THONGING, SEWING
[no value]
[no value]
[no value]
[no value]
Complete all tooling operations and let leather dry before cementing. Skive edges to be cemented (Leather Craft-3). Apply rubber cement to both edges ⅛" back and allow to dry. Apply thin second coat; then press edges together. Tap cemented edges lightly with hammer.
PopularScience_19420201_0140_002_0119.xml
article
185
185
Woodworking
[no value]
Switch Fastened on Top of Scroll Saw for Convenience
[no value]
[no value]
[no value]
FRANK HEGEMEYER
A GREAT for scroll-saw workers is an on-off switch installed on the arm of the machine as shown. The switch, stocked by radio houses, is of the toggle type and rates 125 volts, 3 amperes. For the kind of machine shown, the overall measurements of the switch should not exceed 1¼" long, 1⅜" high and ½" thick.
PopularScience_19420201_0140_002_0120.xml
article
185
185
New Shop Ideas
[no value]
Vise Used to Clamp Band-Saw Blades in Position for Brazing
[no value]
[no value]
[no value]
[no value]
AN INEXPENSIVE vise is easily converted into a clamp to hold band-saw blades in alignment for brazing. All that is necessary is to cut a semicircular notch in the middle of both jaws, as shown. A cutting torch can be used for this, or the notch can be ground, filed, or sawed.
PopularScience_19420201_0140_002_0121.xml
article
185
185
Shop Data File
[no value]
TAPERING TABLE LEGS ON CIRCULAR SAW
[no value]
[no value]
[no value]
[no value]
1. Make a jig from a board 2" by 30" and a block 1" by 3". Cut two steps or notches in the block equal to the width of the taper to be cut, for example ¼". Measure the length of the taper on the jig and nail the block to it at that point. 2. Place the leg to be tapered in the first notch and measure the combined width of leg and jig.
PopularScience_19420201_0140_002_0122.xml
article
186
186,187,188,189
Woodworking
[no value]
More Recreation-Room Furniture
DESIGNED FOR TRAINING CAMPS AND HOME USE
MATERIALS FOR SAWBUCK TABLE
MATERIALS FOR GAME CABINET
MATERIALS FOR ALL-PURPOSE TABLE
MATERIALS FOR MAGAZINE STAND
[no value]
[no value]
JOSEPH ARONSON
THE popularity of any recreation center or game room will depend in large measure upon the provision of comfortable seats and tables for all. Convenient storage space for games and magazines is also important. To meet these needs, several simple furniture designs were suggested in the preceding issue (P. S. M., Jan. ’42, p. 162), and these are supplemented this month by plans for two substantial tables, a roomy game cabinet, and a four-sided magazine rack.
PopularScience_19420201_0140_002_0123.xml
article
190
190,191
Craftwork
[no value]
Modern Desk Tray
[no value]
[no value]
[no value]
[no value]
NICELY grained stock left over from larger projects can be used to advantage in making this rich-looking desk accessory. The work involves some interesting off-center turning. Walnut was used for the original shown in the photographs.
PopularScience_19420201_0140_002_0124.xml
article
192
192,193,194
Craftwork
[no value]
Model Railway Layouts: The Main Line
[no value]
[no value]
[no value]
DAVID MARSHALL
ON THE “grown-up” railroads all track is divided into two classes—main line and yard. And the difference can be summed up in the assertion that the laws of the road do not apply to yards. But the difference is also physical. Yard trackage must be kept separate from the main line; insulated from it by switches that nobody may open except on orders from the dispatcher.
PopularScience_19420201_0140_002_0125.xml
article
195
195,196,197
NEW TAMPERPROOF FUSES
[no value]
Safeguard Your Home
AGAINST ELECTRICAL FIRE HAZARDS
[no value]
[no value]
HAROLD P. STRAND
THOSE unknown experimenters who first discovered that a penny behind a blown fuse would restore electrical service paved the way for many fires that have resulted from overheated wiring. The tinfoil-patch and wired-plug user contributed their bit to the danger that lurks in all unprotected wiring circuits.
PopularScience_19420201_0140_002_0126.xml
article
198
198
The Handy Man
[no value]
Automatic Mercury Switch Made from Old Toothbrush Handle
[no value]
[no value]
[no value]
[no value]
TO ACTUATE an electric mail-box indicator (see P.S.M., Nov. '41, p. 195), an automatic luggage-compartment light, and similar circuits, a mercury switch is ideal. One made as illustrated allows current to flow momentarily when it is tilted—just long enough to operate an annunciator signal or the like.
PopularScience_19420201_0140_002_0127.xml
article
198
198
Miscellaneous
[no value]
Shoelace Knot Retains Plug in Hanging Electric Socket
[no value]
[no value]
[no value]
T. W
THE plug of a heavy-duty electric extension cord won't work loose from an overhead hanging socket at awkward moments if the line and appliance cord are interlaced with a single or overhand knot —the kind used in preparing to tie a shoelace —before the two are plugged together.
PopularScience_19420201_0140_002_0128.xml
article
198
198
Radio
[no value]
Guards from Knitting Needles Protect Tips of Test Prods
[no value]
[no value]
[no value]
[no value]
BY USING the rubber guards from knitting needles on the ends of his test prods, one radio service man prevents them from being dulled when placed in his tool box.
PopularScience_19420201_0140_002_0129.xml
article
198
198
The Handy Man
[no value]
Inner-Tube Valve Stem Serves in Place of Electrician's Pipe Nipple
[no value]
[no value]
[no value]
J. S. TURNBULL
WHEN an electrician's standard ⅛" pipe nipple with its hexagonal nut is not readily obtainable for use in wiring a lamp, an old inner-tube valve stem of the type shown in the drawing at the right can be made to serve as a substitute. The flattened sides of the valve stem are gripped in a vise, the stem is cut to the desired length, and the hole is enlarged to ¼" by drilling.
PopularScience_19420201_0140_002_0130.xml
article
199
199,200,201
Home and Workshop
[no value]
MAGIC OF CHEMURGY
DUPLICATED IN THE HOME LABORATORY
[no value]
[no value]
[no value]
PAINTS, glues, and plastics from skimmed milk; lacquers and synthetic resins from soybeans; alcohol from potatoes, corn, and grain; film, rayon, explosives, and leather substitutes from wood pulp and waste cotton! These are just a few of the magical transformations of the chemurgist, who turns food-product waste and surplus into industrial plenty.
PopularScience_19420201_0140_002_0131.xml
article
202
202,203,204
Home and Workshop
[no value]
High-Fidelity Amplifier
FOR YOUR PA SYSTEM, PHONOGRAPH, OR FM RECEIVER
LIST OF PARTS
[no value]
[no value]
ARTHUR C. MILLER
EXTREMELY versatile, this 10watt audio amplifier may be used with either a crystal or magnetic pick-up for playing recorded music, with a crystal microphone for public-address work, as an amplifier for a high-fidelity tuned radio frequency or superhet tuner, or as an amplifier for use with an FM receiver, such as the one described in a recent issue (P.S.M., Dec. '41, p. 202).
PopularScience_19420201_0140_002_0132.xml
article
205
205
Radio
[no value]
Radio Ideas
[no value]
[no value]
[no value]
[no value]
A NEW LOUDSPEAKER BAFFLE, used for paging and announcing in large industrial plants, projects sound in all directions by means of five evenly spaced apertures in a horizontal plane. The unique feature of this baffle is its construction of nonmetallic, nonvibratory material especially made for the purpose by RCA.
PopularScience_19420201_0140_002_0133.xml
article
206
206,207,208,209,210,211
PHOTOGRAPHY
[no value]
BETTER PRINTS
...and How to Make Them
[no value]
[no value]
KONRAD CRAMER
THE three major steps in the evolution of a photograph are the visualization of the photograph to be, the making of the negative (see P. S. M., Mar. '41, p. 210), and, last but by no means least, the making of the print. The print is the crowning achievement of the amateur photographer’s effort.
PopularScience_19420201_0140_002_0134.xml
article
211
211
Photography
[no value]
Potato-Ball Spoon Saves Time in Weighing Chemicals
[no value]
[no value]
[no value]
CHARLES H. COLES
SMALL quantities of dry photographic chemicals may be weighed more quickly and easily with the aid of one of the small hemispherical spoons commonly found in kitchens where they are used for making fruit or potato balls. There is a tiny hole in the bowl of the spoon which will permit the chemical crystals to run through slowly and evenly to the measuring pan until the scale strikes a balance, and then a slight twist of the spoon will shift the residue to one side and stop the flow instantly.
PopularScience_19420201_0140_002_0135.xml
article
211
211
Photography
[no value]
Wooden Rack on Wall Holds Retouching Accessories
[no value]
[no value]
[no value]
[no value]
RETOUCHING brushes and pencils can be kept at hand on this 18" by 4" wooden rack hanging conveniently near the retouching stand. The one illustrated was made of ½" oak. The two scroll-sawed strips were spaced 3" apart at the lower end for short pencils, but slant apart to the full width of 4" at the top.
PopularScience_19420201_0140_002_0136.xml
article
212
212,213,214
Photography
[no value]
Movie Man Invents Curious Photo Gadgets
[no value]
[no value]
[no value]
WALTER HOLBROOK
FLOYD ABNER RAMSDELL does not call himself an inventor, yet in the 25 years during which he has been producing industrial movies, he has merited the name again and again. Born to the Yankee tradition of helping oneself, the general manager of the Worcester Film Corporation, of Worcester, Mass., is constantly devising new and startling gadgets that he needs in his work and cannot buy.
PopularScience_19420201_0140_002_0137.xml
article
215
215
Photography
[no value]
Bulky Photoflood Reflectors Carried Easily in Folding Plywood Rack
[no value]
[no value]
[no value]
[no value]
THE handling of photo-flood reflectors in the studio and on location is simplified by the use of a combination carrying rack and stand constructed of plywood. Cut two panels to size to take two or three reflectors each, and attach at each of the long edges a strip of molding rabbeted or grooved to fit the reflector rims.
PopularScience_19420201_0140_002_0138.xml
article
215
215
Photography
[no value]
Lotion Dispenser Will Keep Hands from Drying Out in Darkroom
[no value]
[no value]
[no value]
C. C.
AN EASILY applied skin lotion is a help in the darkroom where the photographer’s hands are likely to become dry and cracked from constant contact with the hardening-fixing bath. An ordinary soap dispensing fixture, if one is available, may be installed on the wall, and the lotion bottle attached to it so that a slight pressure will release a few drops into the palm occasionally for a quick rubbing.
PopularScience_19420201_0140_002_0139.xml
article
215
215
Photography
[no value]
Small Projector Designed to Show Color Slides
[no value]
[no value]
[no value]
[no value]
FOR the projection of 2" by 2" Kodachrome transparencies, a small new projector is available with a 5" f/3.5 lens or a 7½" f/4.5 lens. Its design provides for control and dissipation of heat from a 150-watt lamp, and a heat-absorbing glass protects the slide from any possible damage.
PopularScience_19420201_0140_002_0140.xml
article
216
216
Photography
[no value]
Kodachrome Viewer Constructed from Midget Radio Cabinet
[no value]
[no value]
[no value]
ROBERT EICHBERG
A MAGNIFYING viewer for 2" by 2" Kodachrome transparencies can easily be made at comparatively low cost. The basis of the instrument is a small cabinet, which can be constructed or bought. The one illustrated was originally a small radio cabinet, about 8" square, with a sloping panel.
PopularScience_19420201_0140_002_0141.xml
article
216
216
Photography
[no value]
Adhesive Mask Helpful in Treating Negatives Locally
[no value]
[no value]
[no value]
C. L.
LOCAL treatment of a negative, such as intensification or reduction, can be done with great accuracy by using adhesive cellulose tape as a mask. Carefully place strips of the material so as to outline the section to be treated and press the edges of the tape down firmly.
PopularScience_19420201_0140_002_0142.xml
advertisement
217
217
[no value]
[no value]
Eastman Kodak Co.
[no value]
Eastman Kodak Co.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0143.xml
advertisement
218
218
[no value]
[no value]
HASTINGS MANUFACTURING CO.
[no value]
HASTINGS MANUFACTURING CO.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0144.xml
advertisement
219
219
[no value]
[no value]
NATIONAL CARBON COMPANY, INC.
[no value]
NATIONAL CARBON COMPANY, INC.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0145.xml
advertisement
220
220
[no value]
[no value]
E. C. ATKINS AND COMPANY
[no value]
E. C. ATKINS AND COMPANY
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0146.xml
advertisement
221
221
[no value]
[no value]
General Motors Corporation: AC SPARK PLUG
[no value]
General Motors Corporation
AC SPARK PLUG
[no value]
[no value]
PopularScience_19420201_0140_002_0147.xml
advertisement
222
222
[no value]
[no value]
North Bros. Mfg. Co.
[no value]
North Bros. Mfg. Co.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0148.xml
advertisement
223
223
[no value]
[no value]
CASEIN COMPANY OF AMERICA
[no value]
CASEIN COMPANY OF AMERICA
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0149.xml
advertisement
224
224
[no value]
[no value]
THE CARBORUNDUM COMPANY
[no value]
THE CARBORUNDUM COMPANY
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0150.xml
advertisement
225
225
[no value]
[no value]
Advertisement
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0151.xml
advertisement
226
226
[no value]
[no value]
Nicholson File Co.
[no value]
Nicholson File Co.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0152.xml
advertisement
227
227
[no value]
[no value]
The Delta Manufacturing Co.
[no value]
The Delta Manufacturing Co.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0153.xml
article
228
228
[no value]
[no value]
Two New Viewers Light Up and Frame Color Shots
[no value]
[no value]
[no value]
[no value]
Two viewers that light up and frame Kodachromes have been developed by the same manufacturer. Each comes with batteries, bulb, and diffusing system, and is small enough to carry in a pocket or purse. One, incased in a mirror finish, frames a slide semipermanently and is suitable for a transparency one might care to look at frequently.
PopularScience_19420201_0140_002_0154.xml
article
228
228
[no value]
[no value]
Pocket Synchronizer Contains Batteries and Reflector
[no value]
[no value]
[no value]
[no value]
THIS pocket synchronizer, little larger than a pack of cigarettes, comes complete with flash batteries and reflector, and attaches to the tripod socket of any camera equipped with a cable release. The stainless steel reflector is polished to a mirror finish.
PopularScience_19420201_0140_002_0155.xml
advertisement
228
228
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0156.xml
article
229
229
Woodworking
[no value]
Unusually Complete Kit Builds Square-Rigged Slave Ship
[no value]
[no value]
[no value]
[no value]
MANY of the grim vessels that ran slaves from Africa to the new world were built expressly for that purpose in American shipyards. Sharp, clean-cut lines gave them the speed so essential in their illegal trade, and the beautiful model of the Dos Amigos, illustrated above, shows these off to full advantage.
PopularScience_19420201_0140_002_0157.xml
advertisement
229
229
[no value]
[no value]
Advertisement: Popular Science Monthly
[no value]
[no value]
Popular Science Monthly
[no value]
[no value]
PopularScience_19420201_0140_002_0158.xml
advertisement
229
229
[no value]
[no value]
STANLEY TOOLS: Screw Driver
[no value]
STANLEY TOOLS
Screw Driver
[no value]
[no value]
PopularScience_19420201_0140_002_0159.xml
advertisement
230
230
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0160.xml
article
231
231,232
Woodworking
[no value]
Build Your Sailboat Now for More Vacation Fun
BOATS
FURNITURE
MODELS
MISCELLANEOUS
LEAFLETS AND BOOKLETS
[no value]
[no value]
[no value]
NOW is the time to start building that boat for your summer vacation. Glorious days on the water are yours with the 19' cruising sailboat pictured above. It’s a cozy, sea-going home, yet it can be carried on a two-wheel automobile trailer. Use an outboard engine, or let the free wind take you places! Blueprints and instructions are only $2.00.
PopularScience_19420201_0140_002_0161.xml
advertisement
231
231
[no value]
[no value]
Smooth-On Manufacturing Co.
[no value]
Smooth-On Manufacturing Co.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0162.xml
advertisement
232
232
[no value]
[no value]
Old Town Canoe Company
[no value]
Old Town Canoe Company
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0163.xml
advertisement
232
232
[no value]
[no value]
Schult Trailers, Inc.
[no value]
Schult Trailers, Inc.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0164.xml
advertisement
232
232
[no value]
[no value]
Advertisement: Popular Science Monthly
[no value]
[no value]
Popular Science Monthly
[no value]
[no value]
PopularScience_19420201_0140_002_0165.xml
advertisement
233
233
[no value]
[no value]
HARLEY-DAVIDSON MOTOR CO.
[no value]
HARLEY-DAVIDSON MOTOR CO.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0166.xml
advertisement
233
233
[no value]
[no value]
J. H. WINN MFG. CO.
[no value]
J. H. WINN MFG. CO.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0167.xml
advertisement
233
233
[no value]
[no value]
BLUE STAR PRODUCTS
[no value]
BLUE STAR PRODUCTS
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0168.xml
advertisement
233
233
[no value]
[no value]
NATIONAL FLUORESCENT SALES & SERVICE CO.
[no value]
NATIONAL FLUORESCENT SALES & SERVICE CO.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0169.xml
article
234
234,237,238,241
With the Inventors
[no value]
With the Inventors
[no value]
[no value]
[no value]
[no value]
BY COMBINING the basic parts of a watch and a fishing reel, Joseph V. Keenan, of Fort McIntosh, Tex., has produced a device to measure distances of hundreds of feet to within a small fraction of an inch. The largest of three hands on a dial moves continuously, making a complete revolution when a foot of line is paid out.
PopularScience_19420201_0140_002_0170.xml
advertisement
234
234
[no value]
[no value]
ROGERS GLUE CO.
[no value]
ROGERS GLUE CO.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0171.xml
advertisement
234
234
[no value]
[no value]
D. W. ONAN & SONS
[no value]
D. W. ONAN & SONS
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0172.xml
advertisement
234
234
[no value]
[no value]
CUSHMAN MOTOR WORKS
[no value]
CUSHMAN MOTOR WORKS
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0173.xml
advertisement
235
235
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0174.xml
advertisement
236
236
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0175.xml
advertisement
237
237
[no value]
[no value]
ALLIED RADIO
[no value]
ALLIED RADIO
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0176.xml
advertisement
238
238
[no value]
[no value]
THE AMERICAN FLOOR SURFACING MACHINE CO.
[no value]
THE AMERICAN FLOOR SURFACING MACHINE CO.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0177.xml
advertisement
238
238
[no value]
[no value]
C. A. SNOW & CO.
[no value]
C. A. SNOW & CO.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0178.xml
advertisement
238
238
[no value]
[no value]
ALBERT CONSTANTINE & SON, INC.
[no value]
ALBERT CONSTANTINE & SON, INC.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0179.xml
advertisement
239
239
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0180.xml
advertisement
240
240
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0181.xml
advertisement
241
241
[no value]
[no value]
MEAD GLIDERS
[no value]
MEAD GLIDERS
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0182.xml
advertisement
241
241
[no value]
[no value]
Wisconsin Abrasive Company
[no value]
Wisconsin Abrasive Company
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0183.xml
advertisement
241
241
[no value]
[no value]
SYRACUSE GUILDTOOL COMPANY
[no value]
SYRACUSE GUILDTOOL COMPANY
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0184.xml
advertisement
242
242
[no value]
[no value]
Advertisement: POPULAR SCIENCE
[no value]
[no value]
POPULAR SCIENCE
[no value]
[no value]
PopularScience_19420201_0140_002_0185.xml
advertisement
243
243
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0186.xml
advertisement
244
244
[no value]
[no value]
Advertisement: Popular Science Monthly
[no value]
[no value]
Popular Science Monthly
[no value]
[no value]
PopularScience_19420201_0140_002_0187.xml
advertisement
245
245
[no value]
[no value]
Advertisements
[no value]
[no value]
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0188.xml
article
246
246
[no value]
[no value]
Filter in View Finder Shows Monochromatic Tones
[no value]
[no value]
[no value]
FRANK L. KEENE
BETTER tone gradation is obtained in photographs of flowers and landscapes if the proper color-correcting filter is used on the camera. It also helps to estimate the relative brilliance and tone values when shooting the picture if the photographer looks through a monochromatic viewing filter such as the Wratten No. 90.
PopularScience_19420201_0140_002_0189.xml
article
246
246
[no value]
[no value]
Enlarger Provides an Extra Floodlight or Spotlight
[no value]
[no value]
[no value]
E. R.
WHEN preparing to take indoor photos by artificial light, the amateur photographer who needs another floodlight or a spotlight may find just what he wants in his own darkroom. Many enlargers are so constructed that the reflector and bulb can be removed as a unit and used as a floodlight; and by projecting through the lens, spotlight effects may be produced.
PopularScience_19420201_0140_002_0190.xml
article
246
246
[no value]
[no value]
A Self-Indicating Shortstop Bath
[no value]
[no value]
[no value]
[no value]
BY CHANGING its color to a rose red, a recently developed shortstop bath automatically indicates when it has become exhausted. The solution, which is clear when fresh, contains no acetic acid, but in its concentrated form may be substituted for 28percent acetic acid in the same proportion.
PopularScience_19420201_0140_002_0191.xml
article
246
246
[no value]
[no value]
Movie Projector Lenses Now Coated
[no value]
[no value]
[no value]
[no value]
PROJECTOR lenses used in movie theaters are now being coated like certain high-grade camera lenses in order to conserve most of the 30 percent or more light ordinarily lost or scattered. A special coating process has been developed by the RCA Research Laboratories.
PopularScience_19420201_0140_002_0192.xml
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246
246
[no value]
[no value]
CASTLE FILMS
[no value]
CASTLE FILMS
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0193.xml
advertisement
247
247
[no value]
[no value]
THE VACU-MATIC COMPANY
[no value]
THE VACU-MATIC COMPANY
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0194.xml
advertisement
248
248
[no value]
[no value]
SOUTH BEND LATHE WORKS
[no value]
SOUTH BEND LATHE WORKS
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0195.xml
advertisement
249
249
[no value]
[no value]
Wm. H. Wise & Co.
[no value]
Wm. H. Wise & Co.
[no value]
[no value]
[no value]
PopularScience_19420201_0140_002_0196.xml
advertisement
250
250
[no value]
[no value]
R. J. Reynolds Tobacco Co.: Camel
[no value]
R. J. Reynolds Tobacco Co.
Camel
[no value]
[no value]
PopularScience_19420201_0140_002_0197.xml