The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 400
as adopted in America is shown by Fig. 369. Thewires, it will be seen, are terminated one at the top and theother at the bottom of a special transposition insulator. The points of transposition of the different loops must vary, AERIAL LINE CONSTRUCTION 37* and diagrams are drawn for the use of the… … Fig. 369.—Method of Transposition of the special transposition poles. The letters shown againstthe dotted lines are used for locating purposes. In theStandard system of the Bell Telephone Companies in Americathe distance between such special poles is given as 1300 feet,or nearly \ mile, this being…
Telephone
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