File:Bell telephone magazine (1922) (14569540749).jpg

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

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nization, electronicshas had only a small part to play inthe evolution of complex switchingsystems such as No. 4 and No. 5 cross- in communities or improving long dis-tance communication? It will have arole to play in both. It may well bethat broadband circuits for long dis-tance uses will take new form throughlower circuit mile costs that the tran-sistor will make possible. New oppor-tunities for extensive distribution of bar. Transistors, as well as other television in urban areas are possible, solid-state devices, with their capabil- The transistor may allow the use of ity of high speed operation, their our carrier methods over shorter dis- small bulk and low power require- tances and lightly loaded lines. Its ments, will find natural application in use in exchange areas and on rural switching apparatus. lines cannot be excluded. A recently Will the transistor have a role to announced Laboratories development, play in distributing television pictures the tetrode transistor of R. L.
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The first commercial application of the transistor and the phototransistor was in this cardtranslator equipment. The card translator was ijiitially iyistalled in i^S- ^^ ^^ adjunctto the complex telephone switching system used i)i nation-wide operator toll dialing 1953 The First Five Years of the Transistor 79 Wallace, Jr., is an im-portant step. The Tetrode Transistor An initial limita-tion of the junctiontransistor lay in its in-ability to handle thehigher frequencies.This limitation formany uses is now largelyremoved by the inven-tion of the tetrode tran-sistor, which, however,retains the other virtuesof its predecessor. Wecannot foresee all of itsultimate uses, but al-ready it has been usedin a high-performanceamplifier of minute di-mensions. The entireamplifier is housed ina tiny coaxial cableabout one-eighth inch indiameter and one anda half inches long. It requires no more power than its small ices and to industry and civilian usesize suggests, and it can readily sat- generally

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