Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 141
310 MAGNETISM. its poles to each other and to the magnet being as shown in Fig.215. A second bar magnet of about the same power, with its polesopposite, is moved along the first magnet. When the — end of thesecond magnet comes over the key, the key drops. … Fig. 215. The first magnet tends to induce a - pole at the upper end of thekey. The second magnet tends to induce a + pole at the samepoint. The effect of each magnet neutralizes that of the other. Experiment 96.—Magnetize a piece of watch spring about sixinches long (easily obtainable at the watch…
Electricity · Magnetism
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