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 96
or, and fedforward as they wear away by means of a spring holder. 308 HAWKINS ELECTRICITY Ques. Why are carbon brushes so extensively used? Ans. Because they are the only form of brush that willgive good commutation with fixed lead. Ques. What may be said of the different grades ofcarbon in use for… … Fig. 336.—Western Electric box type brush holder. The box which holds the brush is broachedto allow the brush to slide freely, but not loosely, to and from the commutator againstwhich it is normally held by a lever acting directly upon the brush head. This avoids thepossibility of uneven bearing on…
Electrical engineering
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