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 317
Local Fig. 248.—Toll to local cord circuit, sleeve dialing. ahead, the operating wire is switched from the operating relay in thisswitch to that of the next switch. The release trunk is carried throughseparately. Toll Third Selector, with Repeating Coil.—The toll third selector,as it is called, has… … JprckonToll r=, Ji—i-board Q Fig. 249.—Toll selector. real third selector or not depends upon the size of the exchange. Inany case this is the switch which feeds battery to the called telephone.This switch functions as an ordinary selector, except that the oper-ating relay OpRy takes the place of…
Telephone
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