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 211
en, as thelever is slowly moved, the resistance R, which at first is all in circuit with A, is graduallytransferred from A to F. The resistance of R is too small to affect appreciably the currentin F, which cessarily consists of a comparatively large number of turns of fine wire. Thearrangement is… … FlG. 496.—Simplified diagram of the connections of fig. 495» s 424 HAWKINS ELECTRICITY Accordingly, to prevent injury to the winding, a variable resist-ance or starting box is inserted between one supply terminaland the armature so that the pressure may be applied graduallywhile the motor is coming…
Electrical engineering
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