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 172
d from series to parallel by means of a series 384 HAWKINS ELECTRICITY parallel controller, which finally connects each motor directlyacross the supply mains, or between the trolley line and thetrack or ground return. Efficiency of a Motor.—The commercial efficiency of a motoris the ratio of the… … Fig. 431.—Double throw, double pole switch for reversing direction of rotation of a motor.The direction of rotation can be reversed by changing the direction of current in eitherthe armature or the field coils. It is preferable, however, to reverse the direction ofrotation by changing the direction…
Electrical engineering
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