Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 381
Magnetic Top. Magnet and Roll-ing Armature. U-magnet exhibits the persistency with which an armatureadheres to a magnet. The wheel on the cylindric arma-ture acquires momentum in rolling down the arms of themagnet which carries it across the polar extremities and upthe other side (Fig. 345). A very…
Physics · Lantern projection · Electric apparatus and appliances
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