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 203
e same as with thebar inside of it; the magnetism was,however, much stronger when the bat-was 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… … Fig. 172.—Current Anti-clockwise— N-Polarity. ELECTROMA GNETS. 185
Electricity · Magnetism
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