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 111
y RotRy\ 4Hi|iIhMB/) -umiiiui 125 1300^1 ....[ ff* 54321 <;fe,^~ -j: Thru Interrupter orarr VJI fo Ringing Oenervrtvrs Fig. 81.—-Connector with frequency selector. … * s Fi<;. S:*.- Minor switch. PVV -W When the subscriber pulls the hundreds digit, the pulsations formedby its back contact operate the frequency-selector magnet FSM, rotatingthe wipers of the minor switch. Pulsations formed by the contact ofthis magnet keep the ring cut-off relay energized. The…
Telephone
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