Elementary treatise on electricity and magnetism : founded on Joubert's "Traité élémentaire d'électricité" (1909)
Foster, G. Carey (George Carey), Porter, Alfred William, 1863-1939, Joubert, Jules François · London : Longmans · leaf 401
he wire, the needle is found to be stronglymagnetised, and there are as many reversals of polarity, or conse-quent poles, as there are reversals of the current. These poles arealternately of opposite signs. Those of the ends are of the samekind, or of opposite kinds, according as the number of… … Fig. 237. Fig. 238. more powerfvil than steel magnets, -but the property they possess,more especially if the iron is quite soft and the bars short, of beingessentially temporary, of only existing during the passage of thecurrent, of being created and destroyed, so to speak, with it,renders them…
Electricity · Magnetism
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