File:Bell telephone magazine (1922) (14569889920).jpg

Identifier: belltelephonemag22amerrich (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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sources,the Company is trying to meet thatresponsibility. Thus far, more than one third ofall the electronic and commimica- in 1938, when the manager of theCompanys Specialty Products Di-vision strode into a drab oflice of theold Munitions Building of the WarDepartment in Washington and ex-pectantly opened an empty, batteredsuitcase. Are they ready, Colonel? he in-quired. 154 Bell Telephone Magazine SEPTEMBER Less than twenty-four hours earlier,the Colonel had asked Western Elec-tric to undertake the manufacture ofCommand Sets in great number.This instrument is a specialized radiotelephone which enables pilots whilein flight to communicate with eachother and with stations on theground. ploys about 800 transmitters. Toaccommodate them, the availablespace on the air is divided into anumber of broadcasting channels,and these are shared by the 800 sta-tions. As long as each fellow sticksin his own groove, the system workspretty well and there is little jam-ming. Even so, as every listener
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Under the deft touch of a craftsman in the Kearny Works of Western Electric,molten glass becomes an element of a water-cooled tube which may see service in a military radio communication unit It was a tough assignment. Notjust because of the problems of vol-ume production or the pinch of atight delivery schedule, but becauseof these plus specifications calling foralmost impossibly close tolerances inmanufacture. To supply the listener needs of itspeacetime broadcasting, America em- knows, the dials are fairly crowdedand sets must be tuned carefully forgood reception. How different is the situation facedby military radio! Each army usesas many as 4,000 transmitters—andthree, four, five or more armies mayfight jointly on a single front. Thatmeans slicing the radio spectrum into 1943 Alio Marocr 155 thousands of bits—thin bits. It alsomeans that radio receivers, as well astransmitters, must squeeze in betweenthe closely-packed channels and, oncethere, stay there. They must holdtheir

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