Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 391
pressed gas has been employed with 368 EXPERIMENTAL SCIENCE. great success, some of the buoys having been designed tocarry six months supply of gas and to serve as lightships. ELECTRICAL MACHINES. The simplest machine for supplying electricity in smallquantities is the electrophorus, invented by… … e:>^<jv^l^. Electrophorus. To secure the best results, the vulcanite disk and metalcover plate should be warmed, dried, and freed from dust.The vulcanite disk is rubbed with a piece of warm flannel ora cat skin, when it becomes charged with negative electri-city. The cover plate is then…
Physics · Lantern projection · Electric apparatus and appliances
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