Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 338
one line by bridging five fromeach line to earth and using the five frequencies of the multiple har-monic or the non-multiple harmonic. A telephone circuit arrangedfor this service is shown in Fig. 265. The bell is permanently bridgedfrom the required side of the line to earth and is not cut off by… … Fig. 265.—Rural telephone circuit10-party line. Fig. 266.—Isolated exchange. call switch, which rings alternately the bell of the calling and of the calledsubscriber. Isolated Exchange.—The isolated exchange is relatively rare. It hasno connections to other exchanges. The switchboard is very…
Telephone
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