The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 274
appears very compli-cated, and takes g considerable space to. describe, in actual £ practice the systemis very simple andrapid, and leads togreat economy injunction lines andoperators time. Junctions betweenC.B. and MagnetoExchanges. — If theincoming end of thejunction line is atthe C.B. exchange,… … 248 PRACTICAL TELEPHONE HANDBOOK shown in Fig. 259, the lower one being controlled by the calledsubscriber, and the upper one by the A operator, throughthe 12,000-ohni coil of the relay d, the 27-ohm winding notbeing needed. Fig. 259 shows in addition the connectionsof a complete 5-key party-line…
Telephone
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