Bell telephone magazine (1922) (14568410648)

Identifier: belltelephonemag00vol2930amerrich (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:

yand in different ways, and in whichinvention has played an importantpart. From a great number of researchproducts on which we have workedin Bell Laboratories, I have selectedonly three: the telephone receiver,electron tubes for microwave radio, and a newly invented device calledthe transistor. Research on the telephone receiverdates back to Alexander GrahamBell, and has been continuous sincethe birth of telephony. Microwave radio is of later devel-opment, and only in recent years hasit been put to practical use. The transistor is in its infancy, buthas a promising future. All three subjects represent a di-versity in other and obvious respects.Thev are, however, alike in beingvery important in attaining the highquality and low cost that is one of themajor objectives of telephone re-search. In the work that has beencarried on in these three develop-ments, moreover, there are certainfeatures common to all of them thatI should like to point out later. l3 14 Bell Telephone Magazine SPRING

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The Telephone Receiver The telephone receiver is a small andsimple device. In fundamental prin-ciple, the receiver that forms part ofthe telephone on your desk today islike that devised by Mr. Bell withinthe first year of telephone history—and a remarkable year of achieve-ment that was. Over the course ofthe years, other principles have beenincorporated as advances have beenmade, not steadily but in jumps, andthe most radical advance in all theseventy-five years of telephone re-ceiver history has been incorporatedin the latest design of telephone in-strument just recently announced. Looking back over those years oftelephone receiver development fol-lowing Bells original telephone, wesee that they break into two epochs:in the first, design changes were madeby applying the best thought of engi-neers and designers to improving theperformance of a device without de-parting from accepted fundamentalprinciples; and in the second, all suchrestrictions were thrown aside, andan investigation

телефонный журнал колокол 1950 книжные иллюстрации звонок телефонной компании телефон американская телефонно-телеграфная компания история техники телефония изображения из интернет-архива

1922

Prelinger Library

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