File:Bell telephone magazine (1922) (14753874974).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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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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Above: Guards placed over protectors and heat coils and split sleeves on terminals of dispatch-type services at a main frame. These termi)ials will he avoided in routine line insulation testing. Below: Split fiber sleeves on termiiials at a distributing frame to prevent accidental contact while working on adjacent terminals 1953 Dispatch-Type Services phone people everywhere keep thisgoal constantly in mind and strive toachieve it—in spite of the elements,occasional human error, and equip-ment failure. How do we go about trying tomeet this objective of keeping allthese circuits constantly ready forcustomers use? There are threekeys to this: protection, preventivemaintenance, corrective maintenance. Protection With telephone lines and cables,as with highways, there is usuallymore than one route between twopoints and frequently there are sev-eral. If a customer has several serv-ices between two points, generallysome are routed over one of thesevoice highways and—as a precautionagain

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