Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 371
posi-tion, with the lower end toward the north, as indicated inthe dotted lines in Fig. 330, with its upper end in closeproximity to the end of a compass needle. The needle willbe instantly deflected, showing that the rod has becomemagnetic. When turned in the plane of the magnetic meri- 348… … Development of M.ignetism by Torsion. and striking it several blows on the end with a hammer,it becomes permanently magnetic, not strongly, but suffi-ciently to exhibit polarity when presented to a magneticneedle. By twisting a rod of soft iron having one of its ends in Fig. 332. . Fig. 333.
Physics · Lantern projection · Electric apparatus and appliances
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