Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 372
voltaic current.The latter is the more effective method, provided a strongcurrent and a suitable helix or electro-magnet is available.For the magnetization of bars of steel a helix like that shownin Fig. 332 is needed. Its size and the amount of currentrequired will, of course, depend upon the size… … Motion produced by a Permanent Magnet. A current from five or six cells of plunging bichromatebattery is required, or in heu thereof a similar currentfrom a dynamo. The bar to be magnetized is hardened at the ends andplaced in the hehx, the current is then applied, and thehelix is moved from the…
Physics · Lantern projection · Electric apparatus and appliances
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