Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 275
Fig. 157.—Helix. Fig. 158. best. This may be coiled around a wire nail, making ahelix about an inch long, with the wires, say, three layersdeep. The nail may then be withdrawn, and the helix,when an electric current is passing around it, will be foundto be the center of a rather strong magnetic… … Fig. 159.—The floating helix. end of this helix, around which the current is passing inthe direction in which the hands of a watch move, will befound to attract the north pole of a compass needle—thatis, it is a south pole, and the other end of the helix is its ELECTRIC CURRENTS 253 north pole (see…
Physics
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