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 230
•FN … Fig. 232.—Illustrating the alteration of magnetic field due to movement of mass of iron in thearmature. If the masses of iron in the armature are so disposed that as it rotates, the dis-tribution of the lines of force in the narrow field between the armature and the pole pieceis being continually…
Electrical engineering
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