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 187
of equal size, be chargedwith diflferent electricities, and placed side by side. Suspend * These plates should hang even, and any rough edges or particles of fibreshould be thoroughly removed. A small pin, with the head projecting slightlyfrom the foot, will often give a proper balance and motion… … midway between tlieir knobs, by a fine silk thread, a piece ofcork or pith, cut in the form of a spider, with threads drawnthrough it to resemble legs, and the whole colored black. Thiswill vibrate between the two jars, forming an amusing experi-ment, known as theElectric Spider ; and,in a short…
Physics
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