File:Bell telephone magazine (1922) (14570027617).jpg

Identifier: belltelephonemag09amerrich (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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e in fitting it to the needsof the customer and this has, no doubt, been one of the out-standing reasons for the rapid growth. ESTIMATED TOLL CIRCUIT MILES IN PLANT Bell Operating Companies 11 109 13 8 2 7 Z> u u. O 5 in z O 4 _l 2 3 2I y / / / CABLED / / ./) /^ / < DPEN WIRE , 1928 1930 1931 YEAR 1932 FiGXJRE 7 Additions to Plants The rapid growth in the toll business has required a greatexpansion of the toll plant and has been accompanied by mate-rial changes in the character of the plant and in the nature ofthe engineering problems. This expansion has been particu-larly marked in the case of the toll cable plant, additions to 130 DEVELOPMENTS IN TOLL TELEPHONE SERVICE which have been experienced in practically all parts of thecountry. An interesting illustration of this expansion is givenin Figure 7, which shows the relative proportions of the threeimportant types of toll plants at the end of 1928 and the esti-mated trend for this year and the immediate years following. eosio
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Wp»wB«* ting Routes as of Jar*• Cable Extensions planned forCompletion during next five yeaVs Figure 8. Main Toll Cable Routes of the United States Toll Cables It is interesting to note that of somewhat over six and a halfmillion circuit miles in toll plant estimated for the end of thisyear, approximately four and a quarter million will be in tollcable. This percentage will be constantly increasing with theimmediate following years. The extension of the toll cableprogram over the next five-year period contemplates cable ona large proportion of all of the major toll routes of the country.The magnitude of the proposed cable networks is shown inFigures 8 and 9. Figure 8 illustrates the main toll cable routesof the United States and Canada. Figure 9 shows the maincable routes and extensions in the northeastern area of the 131 BELL TELEPHONE QUARTERLY United States and Canada, the development in this area beingconsiderably more dense than in any other section of thecountry. It will be

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