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 98
Ques. How has the construction of carbon brushesbeen varied? Ans. Since, for minimum sparking, it is only necessary thatthe brush have high resistance in the region rear its edge, 310 HAWKINS ELECTRICITY attempts have been made to increase the conductivity of theother portions by combining with the… … Fig. 338.—Holzer Cabot multiple brush holder. Each brush is fastened securely to a machinedsurface by one or two machine screws, making a positive contact. Several strips offlexible copper of ample section to carry the current are interposed between the part of theholder carrying the brush and the…
Electrical engineering
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