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 97
osited copper to insure good contact withthe holder. BRUSHES AND THE BRUSH GEAR 309 Comparison of Copper and Carbon Brushes.—Copperbrushes tend to tear and roughen the surface of the commu-tator, while carbon brushes tend to keep the surface smooth.Copper causes more wear of the commutator than… … Pig. 337 —Westinghouse brush holder. It is made of brass, cast in one piece, and of standardsliding type with a shunt of braided copper wire directly connected to a clamp on eachbrush and to the solid portion of the holder, where it is held by a screw. This shunt relievesthe spring of heavy…
Electrical engineering
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