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 236
he controller. This makes it certain that no possiblecombination of grounds or short circuits can keep the brake magnetenergized and the brake released when the car switch is thrown to theoff position. So long as the brake mechanism is in good working ordermechanically, the positive application of… … Fig. 4,156.—Diagram of National direct current type A, one speed gravity rheostat controller. The application of this brake depends, therefore, not on the line volt-age but solely on the motion of the armature. In any form of elevator braking, mechanical or electric, the energyrepresented by the…
Electrical engineering
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