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 11
f force, or moving into the positionsof best action in the magnetic field. THE ARMATURE 223 Types of Armature.—Although there are many forms ofarmature, all may be divided into three classes, according to thearrangement of the coils or winding on the core, as: 1. Ring armatures; 2. Drum armatures;… … Fig. 248.—Early form of Gramme ring armature, the core being shown cut through, and someof the coils displaced to make it clearer. The core, F, consists of a quantity of iron wirewound continuously to form a ring of the shape shown by the section. Over this is woundabout thirty coils of insulated…
Electrical engineering
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