Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 323
ing coil is provided whichconsists of a few turnsof fine wire connectedin series with the arma-ture. Instruments for re-cording successive in-stantaneous values ofcurrent, voltage orpower are called record-ing instruments. Theyoperate on the sameprinciples as indicatinginstruments, and aremade… … Fig. 204. 312 DYNAMO ELECTRIC MACHINERY. 120. Switchboards.—The object of a central-stationswitchboard is to group the necessary devices for controlhng,distributing and measuring the current received or deUvered,particular attention being directed toward locating thesedevices for convenient…
Electric machinery
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