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 103
BOX TYPE REACTION TYPE Figs. 342 to 345.—Various types of brush holder. Fig. 342, arm or lever type; fig. 343,spring arm type; fig. 344, box type; fig. 345, reaction type. general rules can be given with respect to their construction oruse, but any brush holder must fulfill the following…
Electrical engineering
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