Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 276
ent 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 Fig. 158). Such a helix may be floatedupon a battery solution, and… … m& Fig. 160. magnetic than before the iron core was used. A helix withan iron core is called an electro-magnet. We shall meetwith it many times in future sections. If the iron is verysoft, it will lose its magnetism as soon as the current ceasesto flow. If, however, it is steel or hardened…
Physics
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