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 380
tive battery feed for the line relays. Sub-office Power Equipment and Circuits.—The battery of a sub-office not more than a mile from its main exchange may be floated on themain exchange battery of 25 cells through cable pairs. If the distanceto the sub-office is too great, or the spare cable… … Fig. 285.—Circuits of a mercury arc rectifier charging outfit for a sub-office. icable, it is common practice to charge the sub-office batteries by meansof connections to the commercial source of power supply, tapped intothe sub-office for the purpose. If 110-volt direct current is available,the…
Telephone
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