The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 185
with the Pith-Ball Electrometer. Give the experiment with theLong-haired Man. ELECTRIC llEPULSION. 179 as if in a state of repulsion from its neighbor, maintains anisolated and erect position. Experiment h. — If some Lirds cut from light pith, andfastened by fine thread, be placed upon the ball of… … the birds will gradually rise, attaining a higher elevation as thetension of the electricity increases, until a discharge, accom-panied by a loud report, is eifected between the ball and outsidecoating, when the birds will suddenly fall. To render this experiment the more amusing, a fancy…
Physics
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