Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 26
Fig. 8.—Magnetising a HorseshoeMagnet. … Fig, 9,—MagJ>eti8)atio» b^ I)mde4 Stroke, 8 PRACTICAL ELECTRICITY. to be magnetised, and a strong current 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…
Electricity · Magnetism
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