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Evolution of Electricity from MagnetismSimilar effects were then produced by ordinary magnets : thus the hollow helix just described (34.) had all its elementary helices connected with the galvanometer by two copper wires, each five feet in length; the soft iron cylinder was introduced into its axis; a couple of bar magnets, each twenty four inches long, were arranged with their opposite poles at one end in contact, so as to resemble a horse shoe magnet, and then contact made between the other poles and the ends of the iron cylinder, so as to convert it for the time into a magnet (fig. 2.): by breaking the magnetic contacts, or reversing them, the magnetism of the iron cylinder could be destroyed or reversed at pleasure. Next webpage >> |
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