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 375
he battery to the automaticswitchboard. In Fig. 283 is shown the power switchboard wiring digram of a mainoffice with three sub-offices. In these offices the ringing current andbusy-signal current are furnished by harmonic converters. The chargingis done by means of rectifiers. As indicated in the… … POWER PLANT, SUPERVISORY AND TESTING EQUIPMENT 351 former. The use of such a transformer is common practice, to avoiddanger from a punctured transformer on the commercial power circuit.A reactance coil is connected between the rectifier and the charging mainsto eliminate any noise on talking…
Telephone
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