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 210
g boxes. 422 HAWKINS ELECTRICITY Ques. Describe the construction of a rheostat. Ans. In fig. 493, resistance coils, A, B, C, etc., are mountedin a frame or box, and are connected at intervals to the contacts1, 2, 3, etc. The rheostat arm or lever L is pivoted at S, and whenmoved over the contacts,… … Fig. 494.—Starter with no voltage release for a series motor. t A helical spring coiled groundthe lever pivot P, and acting on the lever A, tends to keep it in the off position against thestop S. This lever carries a soft iron armature I, which is held by the poles of the electro-magnet E, when, in…
Electrical engineering
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