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 198
360* Fig. 186.—Gramme ring armature with six coils. The sine curves 1, 2 and 3, represent theconditions due to coils AA, BB and CC, respectively, and 4, the resultant pulsations. either side are both directed toward the junction and the other atthe junction connected to brush S, at which the…
Electrical engineering
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