Back MatterSource: The Scientific Monthly, Vol. 59, No. 5 (Nov., 1944), pp. ix-xiiPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/18314 .

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THE SCIENTIFIC MONTHLY ix

INFRARED-SENSITIVE PLA TES

In the series of Eastman Spectroscopic Plates are included a number of infrared-sensitive plates

for astronomy and spectrography. They are avail- able in a variety of basic emulsion types and sensi- tizings, as shown in the following table:

Sensitizing Emulsion Sensitivity Class Types Range in A.*

U 1, II, III, IV, V 6600 -7600 L I, IV, V u.v. -8700 N I, IV, V 7700 -8400 K I, II, III, IV, V 7200 - 7600 R I, I1, III, IV, V 7800 -8200 P I, II, III, IV, V 8600 - 9000 M I, II, III, IV 8600 - 10,000 Z I, 11 10,000 -12,000

*The sensitivity range indicated is that for which the plate is specially valuable. In most cases a wider spectral band can actually be recorded.

For particulars concerning these and other types of Eastman Spectroscopic Plates, wrrite for a free copy of Photographic Plates for Use in Spec- troscopy and Astronomy.

EASTMAN KODAK COMPANY

Researeh Laboratories ltoehester, N. Y.

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x THE SCIENTIFIC MONTHLY

ASTRONOMY'S

TELES COPE

(ALILEO'S genius for rapid solution of difficult problems is perfectly ex- emplified by his work with the tele- scope. Within several hours after hearing of the first telescope, he had mastered the principles involved. Within several months, he had made a scientific instrutment of it.

In May of I609, the day after news of the first telescope reached him, he built a telescope of plano-convex and plano-concave lenses and later, having arrived at the relation between magni- fication and foci of lenses, he constructed another telescope which magnified eight times. This he presented to the Doge of Venice in August, I609.

Finally, Galileo produced an instru- ment magnifying thirty-two diameters, and with it initiated the future course of observational astronomy.

Today, 335 years later, other inquir- ing minds are searching for answers to the unsolved problems of astronomy, chemistry, metallurgy, photography, and vision. Aiding these leaders in in- dustry, education and the armed forces are lenses and prisms in instruments of constantly increasing accuracy. It has been the privilege of Perkin-Elmer to

collaborate in the improvement of many of those instruments and their elements.

From this collaboration have come ideas and production techniques that will enable Perkin-Elmer to provide post-war optical instruments that will bring new accuracy to analysis, control, inspection and observation.

WHAT PERKIN-ELMER MAKES Custom-built optical instruments for

industrial analysis2 control, and in- spection.

New optical devices to solve specific problems, such as the all-purpose infra- red spectrometer.

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

Perkin-Elmer is now ioo% in war work, but after the war will resume manufacture of such peace-time prod- ucts as Schmidt cameras, refracting and reflecting telescopes, equatorial mount- ings, oculars, direct-vision prisms, polar- izing eye pieces, and other equipment.

J I

m al p 0

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"1WE'D RATHER

SAY ; We don't like to tell people that equipment and on telephone they'll lhave to wait to get a home manufacturirg facilities and man- telephone. We'd much rather power. Delays in filling civilian say "yes" to requests for service. orders just can't be helped. That's the way it always used All of us telephone people sin- to be. cerely appreciate your patience

But the needs of war still have and understanding in first claim on available telephone this war emergency.

BELL TELEPHONE SYSTEM

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xii THE SCIENTIFIC MONTHLY

4

4 7

25 Years that Created a N*ew orld of Radio I

* From 1919 to 1944 ... RCA has pio- neered in the science of radio and electronics ... from world-wide wireless to national network and international short-wave broadcasting . .. from elec- tron tubes to electron microscopes and radiothermics ... from the hand-wound Victrola to the automatic radio-phono- graph ... from television to radar.

Twenty-five years of service to the nation and the public have made RCA

a symbol of achievement and progress ... RCA is a monogram of quality in radio- electronic instruments and dependability in communications throughout theworld.

From the First World War to the Second, RCA developed and expanded its "know-how" in skilled engineering and production so vitally needed to meet the demands of war . . . these qualities will be reflected as always in the coming nencetime nrcullwtQ nf R CA

RADIO CORPORATION OF AMERICA 30 ROCKEFELLER PLAZA, NEW YORK CITY

RCA LEADS THE WA Y.. In Radio. . Television. . Phonographs. . Records.. Tubes. . Electronics

) ,9,9 j944 25 YEARS OF PROGRESS

IN

RADIO AND ELECTRONICS

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Compass of the World Our Flying Navy A Symposium on Political Geography A gorgeously illustrated short history of

Edited by HANS W. WEIGERT and all phases of naval aviation in the present VILHJALMUR STEFANSSON. war. The Navy Department, through the

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* REESE Outlines oF Economic Zoology--4th Edition

By ALBERT M. REESE, PH.D., Professor of Zoology, West Virginia University. 191 Illus.; 359 Pages; $3.25 (1942)

The facts presented in this book are of great interest to all readers of science and economics. It discusses details essential to know in any well rounded course in zoology. Much of the material is inaccessible to most readers. Recognized authorities, including many Government publications have been drawn upon for important data.

* HECTOR, LEIN & SCOUTEN Electronic Physics

By L. GRANT HECTOR, PH.D., National Union Radio Corporation; HERBERT S. LEIN and CLIFFORD E. SCOUTEN, University of Buffalo. 289 Illus. (Mostly in colors); 355 Pages; $3.75 (1943)

In this book, the fundamentals of electricity and light are presented by means of modern electronic concepts. All electric phenomena are discussed from the electron-proton point of view, and the electric nature of the atoms of all elements is constantly used in the explanations throughout the text. The book has great reader interest because of the restatement of funda- mental principles in the light of newer knowledge.

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This is a new and refreshing study of the fundamental particles of physics. The book contains a wealth of descriptive material and references pertaining to the early experiments from which our modern concepts have sprung. One of the characteristics of the book is the sense of complete continuity, it gives the reader, that exists between the classical and modern physics.

ORDER-form - Please send and charge my account, the following book:

Book ..Name.

Sci. M. 11

THE BLAKISTON COMPANY Philadelphia 5, Pa.

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