Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 493
dto magnetize and demagnetize the core of the movablemagnet or armature. The direction of the current in themovable magnet or armature is such that as its poles areapproaching those of the fixed magnet, its magnetic chargewill be of opposite name to that of the fixed magnet, sothat attraction will… … DYNAMIC ELECTRICITV. 471 The fifty cent toy electro-motor is shown in the annexedengraving. It embodies the main features of the apparatusshown in Fig. 454, differing only in having a permanent fixedmagnet instead of an electro-magnet. The vertical spindle which carries the armature is jour-naled…
Physics · Lantern projection · Electric apparatus and appliances
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