File:Bell telephone magazine (1922) (14568767267).jpg

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

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l core covered by a copperartificial rubbers that became avail- shell> has been provided for use in attached by means of large-headedtacks. The new kind has all the wiresenclosed in a single smooth plasticsheath, and it is fastened by staplesinstead of tacks. It looks better,wears better, is waterproof, and iseasy to paint. It was introduced in1949 and is now the standard for allstation wiring. Even the bare wire used in build-ing rural lines has been improved bymaking it stronger. The strongestformerly available could not be usedon poles more than 400 feet apart.Two kinds have now been provided able during the war. This new drop wire was first putinto commercial production in 1945, * Coded 507A PBX.t Coded 507B PBX. spans up to 350 feet in averagelength. All these wires are so resilient that,after being loaded down with sleetso heavy that they sag all the way to I95J-52 Post-War Achievements of Bell Laboratories POLYETHYLENEJACKET CEMENTFLOODING TERNE COATED STEELSOLDERED SEAM 133
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CABLECORE ALUMINUM Cut-away view of stalpeth cable, showing different types of protective materials the ground, they usually do not break,but return almost to their normal po-sitions when the sleet melts off. Cable Cables are the thoroughfares alongwhich the nations messages travel.For fifty years or more they haveconsisted of bundles of paper-coveredwires inside a sheath of lead. Leadseemed to be the only material withall the necessary properties: water-tightness, resistance to corrosion,bendability, and ease of manufacture.But the supply was sometimes limited. In the 30s the Laboratories con-structed some samples of cables withthe lead replaced by a compoundjacket, each layer of which providedsome of the needed characteristics.These were under outdoor testthroughout the war, and gave a goodaccount of themselves. The pent-up demand for tele-phones at the end of the war wassuch as to require unprecedentedquantities of cable. But there wasalso a pent-up demand for paint andautomobile b

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