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 107
are brush holders carried ? Ans. They are carried by a rocker arm for bipolar, and by arocker ring for multipolar machines, which is mounted upon oneof the main bearings, or upon a support specially provided forit, being pivoted to revolve from the same center as the shaft,to permit shifting the… … Fig. 348.—Western Electric parallel spring brush holder as used on the larger machines. Ques. How may this be avoided? Ans. By insulating one end of the spring, and carrying theentire current directly from the brush itself to the main conduct-ors by a flexible copper strip or cable firmly connected…
Electrical engineering
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