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 68
nk-hunting circuit.The cut-off relay siezes the free trunk and extends the connection. When the subscriber takes his receiver from the hook, the line relayenergizes, grounds the private normal PN for protection, connects themotor magnet MM to the private wiper to test the trunk, and removesthe… … 52 A I TOM A TH ■ TELEPHONY cut-off relay, drawing current through the magnet and springs 3-4 ofthe line relay, pulls up, switching both subscriber lines — L + L fromground, line relay and battery to the wipers — W + W. It also switchesthe private wiper PW from the test circuit of springs 1-2 of…
Telephone
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