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 227
ELECTRIC ELEVATORS 2,881 Full Magnet Direct Current Controllers.—A typical directcurrent control apparatus of the full magnet type consists ofseveral slate panels, mounted on an angle iron frame with allthe connections made on the back of the board. The solenoid switches mounted on the slate panels… … Fig. 4,147.—Diagram of A. B. See No. 4 magnet controller. 2. To accelerate the motor automatically by cutting out the armaturestarting resistance step by step, and also the series field with the laststep of armature resistance (this by means of individual series relaycontrol) giving smooth…
Electrical engineering
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