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 245
oth the automatic limits and over travel. For automatically slowingdown and stopping the car three single pole shaft switches at eitherlimit of elevator travel should be used, making a total of six switchesin all. One switch in each of the two sets of three is used to slow downthe car while the… … ARMATURE RESISTANCE C FIELD R£5 L1tt^-V\A/W\_ •m RJ—/
Electrical engineering
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