Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 392
this charge. The cover may be replaced upon the vulcanite disk, andthe operation may be repeated indehnitely, when the condi-tions are favorable, without further excitation. Instead of avulcanite disk, a cake formed of resin, shellac, and a small Fig. 356. … Winters Electrical Machine. proportion of Venice turpentine may be used. The mate-rials are melted, thoroughly mi.xed, and poured into a circulartin pan. The cake thus formed is allowed to remain in thepan, and is used in the same manner as the vulcanite disk. Winter of Vienna devised a simple…
Physics · Lantern projection · Electric apparatus and appliances
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