Back MatterSource: The Scientific Monthly, Vol. 59, No. 4 (Oct., 1944), pp. ix-xiiPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/18266 .

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TIlE SCIENTIFIC MIONTIHLY ix

"Photographic Plates

for use in

Spectroscopy and Astronomy" Flit TII EDITION

A new, fully revised edition of tdis well-known publication is available. In it are listed the

characteristics of the special plates for scientific work which are nmade in the Ko(lak Research Lab- oratories. There are over one hundred kinds of these plates, distributed among seven basic types of emulsion, each carefully prepared to provide desirable combinations of speed, contrast, granu- larity, and resolving power. 'T'hey are sensitized in various ways to l)ermit photography in spectral regions rangi.ng from the short-wave-length ultra-

0

violet to the infrared at 12O000A. A copy of the new ed-ition of the booklet will

be sent free upon request.

EASTMAN KODAK COMIPANiY Researqh Laboratoris. Rochlester 4I, N. V.

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THE SCIENTIFIC MONTHLY

SuIR ITSAAC PHENOMENON

NEWT , T . N , .

SCIENCE

z i -- :7 ~~4

THE flashing colors of a diamond and the clear tints of a rainbow had been seen by countless people be- fore Sir Isaac Newton asked, "How are these colors formed ?"

His memoir on "Opticks" records the answer in a quaintly worded Theorem: "The light of the sun con- sists of rays differently refrangible." This conclusion, based on many ex- periments with crude glass prisms and a pencil of sunlight slanting into a shuttered room, laid the foundation of all spectroscopy. Fur- ther, it led Newton to invent the reflecting telescope, because he thought that his prismatic colors would make an achromatic lens for- ever impossible.

Today, Sir Isaac Newton's suc- cessors are exploring new worlds of astronomy, chemistry, metallurgy, photography and vision with lenses and prisms in instruments of con- stantly increasing accuracy. Many of these modern explorers-in in- dustry, education and the armed

forces-have called on Perkin-Elmer for help in blazing new trails in opti- cal science.

This exchange of ideas with lead- ers in the sciences plus war-inspired production methods will enable Perkin-Elmer to incorporate in post- war scientific optical instruments extra refinements that will open up new avenues of investigation.

WHAT PERKIN-ELMER MAKES

Custom-built optical instruments for industrial analysis, control, and inspection.

New optical devices to solve spe- cific problems, such as the all-pur- pose infra-red spectrometer.

Special elements such as fine lenses, prisms, flats, photographic objectives, interferometer plates, retardation plates, Cornu prisms, Rochon prisms, Nicol prisms.

- ... X-. -

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What's the Rush?

the neare st telephones to talk with families

g ~~~~~~~and friends at home. Most of the Long

W ~~~~~~~~Distance calls from camps and naval sta-

W -f ~~~~~~~tions are crowded into a few short hours.

qL ~~~~~~~~Many circuits are likely to be crowded at

q ~~~~~~~~~that time and it helps a lot when you "give

7 to 10 to the service men.

II,

B EL L T ELE PH O NE S Y ST EM <tv)

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xii THE SCIENTIFIC MONTHLY

K E>l N G UP W I T H

SYNTHETIC FIREFLIES . .. New West- inghouse fluorescent marker lamp rivals the firefly in economy of light genera- tion. Tiny lamp, consuming only 1/10th watt, will prevent mishaps on dark stairsteps. Unlike lightning bug, it-can be kept glowing continuously- at practically no cost.

1 /50,000,000th OUNCE... That's the weight of a single layer of oxygen atoms the size of an air-nmail stamp. Westinghouse research engineers have built a delicate balance that measures the weight of such a microscopic layer of oxide on metal-to determine re- sistance of special alloys to high temperatures.

POWERHOUSE ON WHEELS...The re- treating enemy knows that the quickest way to paralyze a city is to destroy its powerhouse. Advancing Allies know that the quickest way to restore order is to restore power. A 5000 KW power train, built by Westinghouse, moves in on railroad tracks, hooks up to power lines, starts boiler and generator . . . then lights come on, order emerges.

INSIDE STORY. . Transparent Lucite bearings now permit research engineers to visualize performance of lubricating oil in bearings, subjected to varying operating speeds and pressures. Red pigment shows where oil goes and what it does.

~ *03

PREFORMED PLASTICS . . . New Westinghouse process in plastics man- ufacture "beats" resins into cellulose fibre, then shapes mixture over per- forated copper form. Plastic is peeled off and dried, then placed in heated mold and pressed into final shape. Saves time in making reinforced plastics of intricate shapes.

4sXAat/a/a ....J. . . .

~~~~~~~~~.. ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ .

creating a better yardstick for testing wartime metals

Spectrum analysis provides the quickest and most accurate method for checking the composition of metals used in making guns, planes, tanks and ships.

Iron has long been used as a yardstick of comparison in spectrography-because of the large number of lines in the iron spectrum.

Formerly, the best standard obtainable was iron only 99.9 per cent pure-containing impurities that produced confusing lines in spectrographic pictures.

Westinghouse research engineers tackled the difficult problem of producing a purer iron-a better yardstick for testing wartime metals. T hey accomplished this by fusing the purest iron obtainable in a high-frequency induction furnace, surrounded by an atmosphere of hydrogen gas.

Result: iron 99.99 per cent pure-containing only 1 part metallic impurities in 10,000 parts of absolutely pure iron!

Today, this ultra-pure iron is "mass-produced" by Westinghouse at the rate of 1000 pounds per year-and is used in all parts of the anti-Axis world to improve the quality of war material.

A significant contribution, by Westinghouse, to industry at war and in the days of peace to come. WVestinghouse Electric M Manufacturing Company, Pittsburgh 30, Pa.

Westinh ouse PLANTS IN 25 CITIES OFFICES EVERYWHERE

TUNE IN: John Charles Thomas, Sun. 2:30, EWT, NBC.

Ted Malone, Mon. Wed. Fri. 10:15 pm, EWT, Blue Network.

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. .

7s n Cs

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Chambers's Technical Dictionary The Universe Around Us Edited by C. F. TWENEY and By SIR, JAMES JEANS

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