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 44
ported, as shown in Fig.140, by an insulated metal hoop five orsix inches in diameter. Charge the bagwith the electrophorus. A long silkthread extending each way from theapex of the cone will enable you to turnthe bag inside out without dischargingit. Test the inside and outside of thebag, using… … Fig. 140. Experiment 31.—Vary the experiment by the use of a hat sur^-pended by silk threads. Notice that the greatest charge can beobtained from the edges ; less from the curved or flat surface; nonefrom the inside. 341. A Charge Resides on the Surface.— Many experiments have been made showing…
Electricity · Magnetism
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