Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 24
s. Experiment 21.—Suspend two pith balls as shown in Fig. 127,and touch them with a rubbedglass rod. Instead of con-tinuing to hang side by side,they repel each other and flyapart. If the electrified glassrod be held near them, theyseparate still further. Ifthe electrified sealing-wax,instead of… … Fig. 127. 315. Two Kinds of Electricity. — I7i^ elec-tricity developed on glass is different in kind fromthat developed on sealing-iuax. They exhibited op-posite forces to a third electrified body, each attractingwhat the other repels.
Electricity · Magnetism
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