Back MatterSource: The Scientific Monthly, Vol. 63, No. 1 (Jul., 1946)Published by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/18952 .

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This microradiograph of a 0.002- inch specimen of aluminum alloy shows clearly the segregation of copper-rich components caused by hot rolling and reducing the ma- terial from its original ingot form. Magnification shown is 200X.

"X-RAY VISION" FOR THE METALLURGIST

JY COMBINING the power of x-rays to penetrate with the ability of photog-

raphly to record. and enlarge, microra- diography providles the metallurgist with the kind of "<vision" he needs.

An established technic in metal re- search, microradiography gives him im- portant informat.ion about metal struc- ture below the surface, about impurities

and irregularities. It detects minute cracks and voids in metal specimens . . . reveals the segregation of alloying com- ponents ... records the bonding or fusion obtained by electroplating or welding . . .

For complete information about the wide range and the great variety of photographic materials which Kodak pre- pares for microradiographic use, write...

EASTMAN KODAK COMPANY, ROCHESTER 4, N. Y.

Microra diog raphy .another important function of photography

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oGf VVESTINGHOUSE CEr

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Although world-famous as the inventor of the railway air brake, few people realize that George Westinghouse also pioneered the first auitomatic block-signaling sys- tem for railroads.

While developing the air brake, West- inghouse clearly foresaw the need for im- proved railway traffic controls to meet the demand for greater speed and safety in our rapidly expanding transportation systems.

In those early days, switches and sig- nals were moved by hand. But, in such manually controlled devices, too much depended on the human element.

A watchman might fall asleep - or be- come ill. Or some other mishap might break the human links in the chain and lead to disaster.

In 1881, George Westinghouse began to apply his brilliant inventive genius to the problem of power signaling and inter- locking. As one scientist expressed it, "he used compressed air for the heavy work, electricity to pull the trigger."

And the same basic principles of rail- way signaling, developed by Westinghouse more than half a century ago, still serve in controlling our vast railroad networks of today!

Wes tiSnghos PLANTS IN 25 CITE cIOFFICES EYERYWHERE

TODAY-The Westinghouse Electric Corporation is providinag

se_e1aphores o.(f safety in yet another field-marine transportation. Recently, Westiulghouse engineers equsipped an Old Bay Line steamship with a reaoai navegatimanl aid ...to guide it safely through fog and dark of night. Now the S S "City of Richmond Makes its nightly run hetween Baltimore and Norfolk-safely and firee fror delays due to bad weather. Similar Westinghouse radar installations are planned for inland waterway and coastal craft.

Thozes zov: TED MALONE - Mooday, Wednesday, Friday, 11:45 am, EDT, Anerican Network

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