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 371
anger of noise on talking circuits. If a smooth core armature is notused, the charging circuit is passed through an impedance coil to smoothout the current. The generator is generally compound-wound, but arranged so that itbe changed to a shunt-wound machine by switching one of the armaturelead… … Fig. 279.—Typical power and battery switchboard. disabled and the dynamo must take the switchboard load direct. Acommon specification for the compound winding requires that it shall besuch that under operating conditions it will automatically regulate thevoltage, so that it will not drop lower than…
Telephone
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