Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 208
in the centre of the keeper and the opposite pole in the bend of thehorseshoe. The magnetic distribution is similar to the solid ringwith two poles in C, Fig. 178. 196. Typical Forms of Electromagnets, Their Con-struction and Use.—If the bar electromagnet, Fig. 172, isbent around into a U shape, as… … Fig. 179.—Horseshoe Electromagnets with Keepers. upon a wooden or brass bobbin several layers deep, which isthen slipped over the soft iron horseshoe core, as in the left-hand view of Fig. 179. The spools are then connected bywires so that the current will flow around each spool in theopposite…
Electricity · Magnetism
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