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 92
Pigs. 329 to 332.—Various forms of brush. Fig. 329 gauze brush; fig. 330 laminated orstrip brush; fig. 331 strip and wire brush as used on the early Edison machines; fig. 332carbon brush. Carbon is preferred to copper for brushes on account of the reductionof sparking secured by its use. Wire…
Electrical engineering
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