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 381
e power-supply circuit, as shown. At the same time that the electro-magnet closes the switch, it breaks its own circuit and the switch lever islocked mechanically by the armature of the 310-ohm relay. When thecircuit through the primary of the transformer is closed, the secondarypotential is… … ^l oca I Ground To Sub. - Ex. Test Keys& Phone Fig. 2ISG.- -Circuit of sub-office power plant arranged for remote control of charging ap-paratus and automatic control of heating apparatus. the starting anode and the cathode. The arc is taken up by one or otherof the regular anodes and the…
Telephone
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