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 203
me as with thebar inside of it; the magnetism was,however, much stronger wThen the batwas inserted in the coil. If suspendedor poised, see Fig. 148, the helix and itsiron core will take up a position in the earths field similar to thehelix or compass needle. It will also attract or repel the poles… … Fig. 172.—Current Anti-Clockwise—N-Polaritv . ELECTIiOMAdXETS. 185
Electricity · Magnetism
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