. BSTJ 1: 1. July 1922: Philadelphia-Pittsburgh Section of the New York-Chicago Cable. (Pilliod, James J.) . conomical results. Long underground cables, as is well-known, have been in operation for many years between Boston, NewYork, Philadelphia, Baltimore and Washington, Chicago and Mil-waukee and in other sections. However, the type of cable and asso-ciated apparatus which is now being used in the development of themore comprehensive plan is quite different from that originally usedbetween Boston and Washington and in the other sections, particu-larly in the use of copper conductors of a sm
. BSTJ 1: 1. July 1922: Philadelphia-Pittsburgh Section of the New York-Chicago Cable. (Pilliod, James J.) . conomical results. Long underground cables, as is well-known, have been in operation for many years between Boston, NewYork, Philadelphia, Baltimore and Washington, Chicago and Mil-waukee and in other sections. However, the type of cable and asso-ciated apparatus which is now being used in the development of themore comprehensive plan is quite different from that originally usedbetween Boston and Washington and in the other sections, particu-larly in the use of copper conductors of a smaller gage combinedwith improved loading coils, the vacuum tube telephone repeater (6 BELL SYSTEM TECHNICAL JOURNAL and other methods and apparatus which are the result of recentdevelopments. Lead-covered aerial cable supported on wooden polelines is to be used in general on all of the routes except in the twosections just mentioned and through cities or where special condi-tions exist for short distances. The possibility of now using con-ductors of No. 16 and No. 19 A. W. G. instead of conductors up to. Fig. 5—General View of Pole Line Carrying Aerial Cable No. 10 A. W. G. as in the older cables, has contributed to make aerialconstruction rather than underground conduit the more economicalin many sections, as one cable will provide for a much greater numberof circuits and consequently fewer cables will be required. Line Construction The general type of aerial construction which was used for over250 miles of the total distance of 302 miles from Philadelphia to Pitts-burgh may be seen from Figs. 5 and 6 which illustrate the poles, steelsuspension strand, metal supporting rings and the cable. The polesare 25-foot untreated chestnut spaced 100 feet apart and designedto carry additional cables in the future. While the poles are newand carry only one cable they have a factor of safety of about 9 underthe most severe storm conditions expected, but this will, of course, bereduced as
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelepho, bookyear1922
