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 126
Figs. 94 to 96. — Simple bar magnet and horse shoe magnet with keeper. These are knownas permanent magnets in distinction from electro-magnets. The horse shoe magnet willattract more than the bar magnet because both poles act together. A piece of soft iron,or keeper is placed across the ends of a…
Electrical engineering
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