Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 208
ELECTR OMA GNETS. 189 … Exp.61: Connect a horseshoe electromagnet, Fig. 179, with aoource of current so that the limbs are like poles. Attract the keeperand then.plunge the magnet into iron filings. One pole is producedin the centre of the keeper and the opposite pole in the bend of thehorseshoe. The magnetic distribution…
Electricity · Magnetism
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