Wright, Mark R., 1854- · London : Longmans · leaf 180
h ball, suspended froma gas bracket or ordinary support by a cotton thread, movestowards glass rubbed with silk, or sealing-wax rubbed withflannel; even after contact it again moves towards them. Attraction and Repulsion Iji Suspend a pith ball by a dry silk fibre. Fig. l66 shows a con-venient… … Fig. i66. it with the hand, and moved it by the dry silk thread. The pithball experiment, as far as repulsion is concerned, fails (try it) if thesilk thread be damp, or if a cotton thread be used. The metal ballin fig. 165 was fastened to a rod of shellac suspended by silk. Therod of the…
Physics
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