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 35
Fig. T31. 304 FRICTIONAL ELECTRICITY. … Fig. 132. {a.) Conductors for the purposes of this and similar experimentsmay be made of wood, covered with tin-foil, gold leaf or Dutchleaf. They may be insulated by fastening them on top of long-necked bottles or sticks of sealing-wax, or by suspending them bysilk threads. (6.) Prick a pin-hole…
Electricity · Magnetism
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