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 234
BRAKE! MAGNET Fig. 4,153.—Diagram of Burdett and Roundtree push button controller for dumbwaiter. at the last landing, instead of coasting past the limits whenlight or heavily loaded and hitting the bumpers at the top orbottom of the shaft. Ques, When is the motor series field winding used? Ans. It… … Fig. 4,154.—Cutler-Hammer (Schureman type K) direct current reversible single speed pushbutton controller for passenger elevators or dumb waiters. The push buttons are located, on the car or at various landings. The controller is of panel construction, all wiring beingexposed on the back. The motor…
Electrical engineering
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