Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 503
mature wire. This split ferrule, together with springs, H, which press upon its diametrically opposite sides, forms a commutator which sends the momentary currents of like name all in one direction. The slots of the ferrule are arranged relative to the springs, H, and armature, so when the polar… … DYNAMIC ELECTRICITY. 481
Physics · Lantern projection · Electric apparatus and appliances
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