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 13
the ends of each being brought outto the commutator side of the armature, the arrangement of THE ARMATURE 225 the coils on the ring and connections with the commutatorbeing shown in fig. 247, examples of actual construction beingshown in figs. 248 and 249. Ques. For what conditions of operation is… … Fig. 250.—Distribution of magnetic lines of force through a Gramme ring. Since the metalof the ring furnishes a path of least reluctance, most of the magnetic lines will follow themetal of the ring and very few will penetrate into the aperture of the interior. i Thiscondition causes a serious…
Electrical engineering
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