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 251
sed, thus preventing the cutting out of the next step of resistance until the motor has properly accelerated and the surge of current incident to the closing of the previous switch has died down. In construction each circuit relay has three coils connected between its switch and thethree phases of… … Fig. 4,174.—Cutler-Hammer direct or alternating current rotating cam limit switch for usewith controllers in connection with the traveling nut mechanism of the winding drummachine. The limit switch is double pole, and in operating to stop the elevator, disconnectsboth sides of the control circuit…
Electrical engineering
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