Back MatterSource: The Scientific Monthly, Vol. 62, No. 6 (Jun., 1946)Published by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/18852 .

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4. - . Remark~~~~~able record of Planetary Ne'bula NGC- 7293-a stellar system not unlike ours, and sev- eral hundred light years away-made by the 100-inch Mt. Wilson observatory telescope on Eastman 103 E Spectroscopic plate, hypersen- sitized in ammonia. Exposure time 4 hours; plate shielded with ifters admitting only red light,

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When photography was first used in telescopes which follow celestial objectives with mathematical preci- sion... when photography made pos- sible the recording, with long expo- sure, of very faint light ... astronomi- cal knowledge entered on a new era.

Throulghout this new era, Kodak Research has continued to help in- crease the effectiveness of observa- tory telescopes ... and today Kodak's Researchl Laboratories provide more than one hundred different types of photographic plates, among them plates carefully prepared for use with specific portions of the spectrum.

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Yes, or alike as two telephone handsets made by the sanje process. Yet, pins or handsets- no two could ever be made exactly alike. Dimensions weight, performance - all vary every time due to variables in manufacture. How can these variables be controlled?

Back in 1924, Bell Laboratories' mathema- ticians and engineers teamed up to find out, forming the first group of quality-control specialists in history. They invented the now familiar Quality Control Chart, designed in- spection tables for scientific sampling. They discovered that test data mathematically charted in the light of probability theory were talking a language that could be read for the benefit of all industry.

Western Electric, manufacturing branch of the Bell System, applied the new science to its large-scale production. In war, it was used by industrial and government agencies of the United Nations in establishing and maintaining standards for military materiel. A Quality Assurance Department, a novelty back in the nineteen-twenties, has come to be indispensable to almost every important manufacturer.

Scientific quality control is one of the many ideas of Bell Laboratories that have born fruit in the Bell System. The application of mathe- matics to production is helping good manage- ment all over the industrial world - and furthers the cause of good telephone service.

\ EBLL TELEPHONE LABORATORIES i:)~) EXPLORING AND INVENTING, DEVISING AND PERFECTING FOR CON-

TINUED IMPROVEMENTS AND ECONOMIES IN TELEPHONE SERVICE.

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