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 225
Fig. 4,144 and 4,145.—Cutler Hammer direct current reversible single speed semi-magnetcontroller with separate reverse switch for slow speed passenger or freight elevator.Fig. 4,144, self starting; fig. 4,145, Schureman type BR reverse switch. The controllerconsists of a sliding contact controller…
Electrical engineering
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