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 36
ings, thebrush comes in contact alternately with segments of each set. 248 HAWKINS ELECTRICITY The brush then must be large enough to overlap at least twosegments, so as to collect current from both windings simul-taneously. Both windings then are always in the circuit inparallel. Ques. What is the… … Fig. 272.—A progressive wave winding. If the front and back pitches of a wave winding be suchthat in tracing the course of the winding through as many coils as there are pairs of poles, asegment is reached in advance of the one from which the start was made, the winding is said tobe progressive.…
Electrical engineering
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