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 250
speed unless thisinterlocking be provided. Adaptation: 25 to 60 cycles. Shaft limit switches may beinstalled in the elevator shaft if desired to stop the motor at the travel limits. 2,904 HAWKINS ELECTRICITY The secondary starting resistance is of the cast metal gridtype and is mounted in a frame… … Fig. 4,173.—Diagram of Otis type alternating current two or three phase mechanical controller. Current Relay Acceleration.—The acceleration of the motor isaccomplished by a parallel solenoid self-starter with secondary startingresistance. A suitable number of double pole alternating currentsolenoid…
Electrical engineering
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