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 235
ve of the jack, the sleeve of the plug, relay 15 and the lamp 8 tobattery. When 15 operates, it breaks the circuit through 14,which in turn breaks the crcuit through lamp 6. Lamp 8 glows untilthe called party responds, when the talking current operates the cordrelay 20, which shunts out lamp 8.… … AUTOMATIC TRAFFIC DISTRIBUTOR EQUIPMENT 215 relay 13, the middle rail and the corresponding bank contact of theselector to the winding of relay 14 and the make contact of relay 15 tobattery. This will cause the lamp 6 to light again and give the disconnectsignal to the operator at the receiving…
Telephone
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