File:Bell telephone magazine (1922) (14733178496).jpg

Identifier: belltvol20elephonemag00amerrich (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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tional carrier systems now being in-stalled on open wire. Additional cir-cuits will also be provided this yearto serve intermediate points along theroute. When the cable is completed to thecoast, next year, sufficient type-K sys-tems are expected to be put into opera-tion to provide about 100 additionalcircuits, and ultimately, when thecable is completely equipped with car-rier, it will provide a total of 500 to600 circuits. The cost of this cable,with its initial equipment, is expectedto be about $21,000,000. Active engineering work on thetranscontinental cable has been pro-ceeding for several years. To viewthis important project in its properperspective, it must be rememberedthat universal service was a definiteobjective of the Bell System from itsinception, and that the extensive tech-nical advancement and engineeringeffort of the System has continuouslybeen brought to bear on current prob-lems of extending service or of im- /54i Engineering the Transcontinental TelephoneXCable 209
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Profile of the Transcontinental Carle Route proving it by the use of new instru-mentalities. The establishment oftranscontinental service on January25, 1915, was the result of the co-ordination and application of the tech-nical advances made by the Bell Sys-tem up to that time in outside plantconstruction, the design and construc-tion of loading coils, and of telephonerepeaters with their associated hybridcoils and balancing networks. Transcontinental Development After the initial years, during whichadditional transcontinental facilitiesneeded were provided by the stringingof additional open wires, carrier cur-rent development reached the com-mercial state, and carrier systemswere put into transcontinental servicebetween Chicago and Sacramento in1926. This was the type-C, three-channel system, and more systems ofthis type were added from time totime as transcontinental traffic in-creased. By 1937, four main transconti-nental open-wire routes had been con-structed, and type-C systems w

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