File:Bell telephone magazine (1922) (14569585198).jpg

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Description
English:

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

View Book Page: Book Viewer
About This Book: Catalog Entry
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Text Appearing Before Image:
Left: Anti-aircraft gun positionssuch as these are connected withcommand and other locations bytelephone circuits. Below: AnAir Defense Control Centerin operation as the General pre-pares to send out an alert 142 Bell Telephone Magazine AUTUMN by means of pulses or spurts of cur-rent will read meters a short distanceaway, and others that by means ofsimilar signals will open and closevalves or start and stop motors hun-dreds of miles away. The points served are scatteredfrom one end of the country to theother, and in many parts of Canadaas well. All manner of places are
Text Appearing After Image:
included: swamp and desert, city andwide-open prairie, mountain top andpower dam, remote Armed Forcesbases whose very locations are clas-sified information, and metropoli-tan air fields. Some locations arereached only by radio or by a longopen-wire line, while for others inhighly developed areas there is achoice of many routes. Conditionsat these spots also present great con-trasts: a comfortable business oflice,the noisy control tower at an airport,a pumping station where the atmos-phere is explosive and the slightestspark would spell catastrophe, anArmy installation where the mainte-nance people must receive govern-ment clearances before they are per-mitted to work. All these circuits have one thingin common. They must be ready forimmediate use whenever they areneeded, and they must be free frominterruptions and interference. Tele- 17. ff. l^ f> f* Wjl

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27 July 2014

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This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/14569585198. It was reviewed on 17 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

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