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 207
agnetic Polarity of an Iron Ring. passed in from any point and flows around each half of the ring in anopposite direction to a diametrically opposite point and thenback to the battery. The arrows indicate the direction of cur-rent and magnetic lines of force, from which it will be seenthat a… … ELECTR OMA GNETS. 189
Electricity · Magnetism
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