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 279
ELECTRIC ELEVATORS 2,933 In some elevator motors, the free end of the armature shaft is purposely made squareto facilitate turning the shaft with a wrench as just mentioned. Car Beyond Control.—If the operator find he has lost control ofthe car and cannot stop it, he should not become frightened… … Fig. 4,207.—Otis spring return oil buffer or cushion. These are placed in the shaft one underthe car and one under the counterweight, and are arranged to bring either the car or thecounterweight to a positive stop, through the telescoping of the buffer—this occurringat a carefully calculated rate…
Electrical engineering
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