Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 504
DYNAMIC ELECTRICITY. 481 … 482 EXPERIMENTAL SCIENCE. which the permanent magnet, F, is provided with poleextensions of soft iron surrounded by fine wire bobbins, D.These bobbins are connected like an electro-magnet, andwhen the armature, G, is turned so as to send a direct cur-rent through the springs, H, an alternating…
Physics · Lantern projection · Electric apparatus and appliances
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