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 177
rom S2 to N2), so that the direction of the whirlsand the needles natural lines are coincident. Consider the right hand, Fig. 134, as N, and the left hand 158 PRACTICAL ELECTRICITY. as S. The direction of the currents field underneath tin-wire is then from west to east, and the N-pole of the… … A m a rf$ ^W* Fig. 136.—Clock Rule for the Direction of WhirlsAround a Straight Wire. word NOSE. Theconverse of thisstatement is alsotrue. If a needleheld under a wirepointing N and Sis deflected eastwhen the current isflowing, the direc-tion of the currentis from N to S.Obviously, w h e nthe…
Electricity · Magnetism
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