Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 204
equal output will require only 450 revolutions, and one of eight polesonly 225 revolutions per minute. 184 HAWKINS ELECTRICITY Ques. What is a self-exciting dynamo? Ans. A machine in which the initial excitation of the fieldis due to the residual magnetism retained by the cores. Ques. What may be… … Fig. 190.—Series wound dynamo, used for series arc lighting, and as a booster for increasingthe pressure on a feeder carrying current furnished by some other generator. The coilsof the field magnet are in series with those of the armature and external circuit, and con-sists of a few turns of heavy…
Electrical engineering
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