Back Matter Source: The Scientific Monthly, Vol. 61, No. 3 (Sep., 1945), pp. ix-xii Published by: American Association for the Advancement of Science Stable URL: http://www.jstor.org/stable/18591 . Accessed: 02/05/2014 21:19 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp . JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. . American Association for the Advancement of Science is collaborating with JSTOR to digitize, preserve and extend access to The Scientific Monthly. http://www.jstor.org This content downloaded from 62.122.77.75 on Fri, 2 May 2014 21:19:41 PM All use subject to JSTOR Terms and Conditions
Transcript
Back MatterSource: The Scientific Monthly, Vol. 61, No. 3 (Sep., 1945), pp. ix-xiiPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/18591 .
Accessed: 02/05/2014 21:19
Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at .http://www.jstor.org/page/info/about/policies/terms.jsp
.JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range ofcontent in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new formsof scholarship. For more information about JSTOR, please contact [email protected].
.
American Association for the Advancement of Science is collaborating with JSTOR to digitize, preserve andextend access to The Scientific Monthly.
http://www.jstor.org
This content downloaded from 62.122.77.75 on Fri, 2 May 2014 21:19:41 PMAll use subject to JSTOR Terms and Conditions
T HIS new plate is known as Eastman Spectroscopic Plate, Type 649. It is normally supplAied with GH
sensitizing and with antihalation backing. rf he resolv- ing power is at least 1000 lines per millimneter. rThe
llate can also be obtained unsensitized (Class 0) with lower speed and contrast.
When results of higher contrast are required and extreme resolution is not paramount, the use of the Eastman Spectroscopic Plate, Type 548-GH (resolving
Iower, over 500 lines per millimeter) is recommended. Botlh of these high resolution plates have low stain
characteristics. Furtlher information wvill be supplied on request.
EASTiMAN KOIDAK COIMPANY Ite8eaurch Laboratorie 8 I ozIiester w, N. V.
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How many of tese do you own.? If you look under your car, you'll prob- ably find a couple of gadgets something like this one.
They're shock absorbers. They take the sting out of sudden
bumps and jolts. They make a rough road smoother. And if you're wise, somewhere in your desk, or bureau drawer, or safe deposit box, you have a lot more shock absorb- ers. Paper ones. War Bonds.
If, in the days to come, bad luck strikes at you through illness, accident, or loss of job, your War Bonds can soften the blow.
If there are some financial rough spots in the road ahead, your War Bonds can help smooth them out for you.
Buy all the War Bonds you can. Hang on to them. Because it's such good sense, and because there's a bitter, bloody, deadly war still on.
83YALTHE 80NDS YOU CAN..& KCEP ALLUTHE BONDS YOU 8Ut
American Association for the Advancement of Science Smithsonian Institution Building
Washington 25, D. C.
This is an official U. S. Treasury advertisement-prepared under auspices of Treasury Department and War Advertising Council
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In a test cell an ENGINEER studies the performance of a jet-propulsion engine y0 that is expected to produce greater, thrust-for its weight-than any made in America.
the na.e on the .1-P ENGINE is Westinghouise.
In a synthetic rubber platnt a CHEMIST ulses a maiss spectrometer to anialyze a complex gas mixture by sorting its mole- cule-reducing analyzing time from days to a matter of mv,inutes.
.. te izan on the MAS SPCTROMETER is Westingho se.
High in the air a SCIENTISTI adjusts a fulchronog aph which accurately records tthe intensity and duration of thunderbolts -in the never-ending study of improved protection against lightning.
. .. the namie on the EU7LC(1 0 RO \iO(RzIPIJ is WJestinghouse
In a refining. plant a METAlI, -URG,IST uses an Ignitron* rectifier foi the more efficient conversion of alternating to direct current-in producing vast quantities of aluminum for our war effort.
the nahine on the IGNITRON RECTbIFIER is [/Vstinqh oitse.
Reg,. 1U.S. Pat. Off.
TODAY-Westinghouse war products are making vital contributions to final Victory over our enemies in the Far East.
TOMORROW-Peacetime products . .. backed by West- TesE 1 iSng inghouse research, engineering and precision manu- PLANTS IN 2S CITIES OFFICES EVERYWHERE facttiu-e . . will contribute to greater efficiency in
ind(utistry and better living in otur homes.
Tune in: JOHN CHARLES THOMAS-Sunday 2:30 pm, EWT, NBC * TED MALONE-Mon. thru Fri., 11:45 am, EWT, American Nei%
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FORTY-FIVE years elapsed be- tween Fraunhofer's discovery of the black lines in the solar spectrum and Kirchhoff's explanation of their significance. In i 859, Kirchhoff, professor of physics at Heidelberg, announced the mathematical de- duction and experimental proof of the law which honors his name:
"The relation between the powers of emission and absorption for rays of the same wave-length is constant for all bodies at the same temper- ature."
From this knowledge of the cause of the black lines in the solar spec- trum, Kirchhoff developed the theory that the sun was surrounded by a layer of vapors formed by the incandescent elements of the sun and that each vapor absorbed the rays emitted by its corresponding element. Thus was the actual com- position of the sun revealed and thus was spectroscopic work given its greatest impetus.
Spectroscopy is still being given new refinements to make it more valuable in industrial, educational, and military research and quality-
control. Perkin-Elmer is proud of its contributions of simplicity and versatility to this important work, through its new All-Purpose Infra- red Spectrometer.
Similarly, Perkin-Elmer will bring to post-war analysis, control, in- spection, and observation new re- finements in other scientific optical instruments.
WHAT PERKIN-ELMER MAKES
Perkin-Elmer serves the optical sciences that broaden man's horizons by supplying them with:
Custom-built optical instruments for industrial analysis, control, and inspection.
New optical devices to solve spe- cific problems, such as the all- purpose infrared spectrometer.
Special elements such as fine lenses, prisms, flats, photographic objectives, interferometer plates, retardation plates, Cornu prisms, Rochon prisms, Nicol prisms.
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TH BIRD WITH THE IB-MILF AI The wire you see with the parachute on the end of it is a telephone wire, being payed out from a C-47 cargo plane.
Bell Telephone Laboratories, working with the Air Technical Service Command of the Army Air Forces, developed this idea. It will save precious lives and time on the battlefield.
A soldier throws out a parachute with the wire and a weight attached. The weight drops the line to the target area. From then on, through a tube thrust out of the doorway of the plane, the wire thrums out steadily - sixteen miles of it can be laid in 6 2/3 minutes. Isolated patrols can be linked quickly with headauarters. Jungles and mountain ranges
no longer need be obstacles to communication. This is in sharp contrast to the old, danger-
ous way. The laying of wire through swamps and over mountains often meant the transport- ing of coils on the backs of men crawling through jungle vegetation, and in the line of sniper fire. It is reported that in one sector of the Asiatic theater alone, 41 men were killed or wounded in a single wire-laying mission.
Bell Telephone Laboratories is handling more than 1200 development projects for the Army and the Navy. When the war is over, the Laboratories goes back to its regular job - helping the Bell System bring you the finest telephone service in the world.
B E L L T E L E P H O N E L A B O R AT O R I E S Exploring and inventing, devising
and perfecting for the Armed Forces at war and for continued Improvements and economies In telephone service.
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With the new RCA lifeboat radio, shipwrecks need no longer take a terrible toll of lives.
A two-wayradiophone-forlifeboats!
Here's when a telephone comes in rather handy ... when you can "get your party" and hear "We'll pick you up in a couple of hours!"
With the new RCA compact life- boat radio, that's exactly what hap- pens. A kite, or a balloon, takes the antenna up as high as 300 feet.
Turn the power-generating cranks and out goes an SOS -along with a direction-finder beam so shore sta- tions can figure your exact location.
But even more amazing, ship- wrecked mariners can talk with the men on their way to the rescue+.
They can "pick up" ships, airplanes, and land- 1000 miles away!
Endless research, such as went into developing this lifeboat radio, goes into all RCA products.
And when you buy an RCA Victor radio, or a television set or a Victrola, you enjoy a unique pride of ownership in knowing that you possess one of the finest instruments of its kind that science has achieved.
Radio Corporation of America, RCA Building, Radio City, New York 20. Listen to The RCA Show Sundays, 4:30 P.M., E.W.T., over the NBC network.
Joseph McDonald and Donald Kolb (holding balloon) are the Radiomarine engineers who de- veloped this lifeboat radio. Here is the balloon that is inflated with helium and carries the antenna 300 feet into the air. At left is your miniature "broadcasting studio" and receiving set.
Pj RADIO CORPORATION of AMERICA
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