Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 413
Dancing Pith Balls. Gassiots Cascade. with the machine), a cascade of wavy light overflows thegoblet like a fountain. The pith ball electroscope, shown in Fig. 390, consists of arod having at its upper end a ball and at its side a scale, fromthe angle of which is suspended a pith ball on a filament…
Physics · Lantern projection · Electric apparatus and appliances
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