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 27
of electricity passedthrough the coil from a battery or dynamo, as in Fig. 10, thesteel will be permanently magnetised with a N and S-pole,after the current is turned off. Tapping the end of the steelwith a hammer, while it is under the influence of the current,will produce better results. Instead… … V Fig. 10.—Magnetisation by an Electric Current be obtained. In making a horseshoe magnet by tins method insert one limb all the way in the spool ; turn on thecurrent; tap it; turn off the current; remove this limb, andinsert the other limb in the opposite end of the coil andrepeat the operations.…
Electricity · Magnetism
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