Bell telephone magazine (1922) (14753032921)

Identifier: belltelephonevol3132mag00amerrich (find matches)

Title: Bell telephone magazine

Year: 1922 (1920s)

Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept

Subjects: Telephone

Publisher: (New York, American Telephone and Telegraph Co., etc.)

Contributing Library: Prelinger Library

Digitizing Sponsor: Internet Archive

Text Appearing Before Image:

wn in single crystal Jorm in this apparatus by K, Buehler 1953 The First Five Years of the Traiisistor 85 ^ering the entire rangeof technology, was sub- sequently published asa two-volume classifiedwork. Later still, inthe summer of 1952, ashort course for univer-sity professors was held,attended by professorsfrom over thirty institu-tions. The result hasbeen widespread devel-opment both in univer-sity research and in theindustry. Specific military ap-plications of the tran-sistor must, of course,remain classified, but anappreciation of itspromise in military usecan still be had, as thefollowing exampleshows. In World War II, radar played a very important part, uses, large and small, for transistors.Today, aircraft bomb sights are built Reliability, small size and weight, lowaround radar. Detection of targets, power consumption—these are goalsrange, and bearing all come from of the designers of military equip-radar. This information feeds into a ment. The transistor takes us a large

Text Appearing After Image:

The photo-transistor ^point-contact junction andother transistors for special Bell System and militaryuses are responsibilities of development engineers A. E.Anders071 (left), J. N. Shive (center) and R. M. Ryder computer which quickly determinesthe proper release point, taking intoaccount other information as well:aircraft and wind velocity, altitude,and the flight characteristics of themissile. The radar and computer step towards these goals. Future Developments Todays electronics industry isbuilt largely on an invention of LeedeForest in 1907: the three-element make a highly intricate electronic sys- vacuum tube. The first commercial tern, using hundreds of vacuum tubes use of the vacuum tube in transcon- and considerable power, and occupy- tinental telephony was in 1915, eight ing much valuable space. Perhaps 80 years later. The vacuum tube had ex- per cent of the vacuum tube functionsmay equally well be performed bytransistors, with savings in space,weight, and power alone of maj

bell telephone magazine 1953 internet archive document belltelephonevol 3132 mag 00 amerrich book illustrations telephone bell telephone company american telephone and telegraph company history of technology telephony radars images from internet archive

1922

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