Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 244
Fig. 281. In a similar way, if the excited tube be brought near a pith ball *See Section 896. POLAEITY. 235 suspended by a thread, the ball moves towards the tube, touchesit, remains in contact a moment, and retires. Fig. 281. A beautiful way of showing this attraction is to excite alarge tube very…
Physics
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