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 227
Figs. 222 to 225.—Several forms of pole piece. Where the extremities project as in figs. 222and 223, they are called horns. The object of these is to reduce the reluctance of the airgap. The width of fringe of the magnetic field is influenced by the shape of the polepiece; the margin of fringe…
Electrical engineering
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