Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 52
Fig. 20. gauze, supported as in Fig. 20, upon an insulatingstand, and to which silk strings were attached, by whichit could be turned inside out. It was charged, andthe charge was shown by the proof, plane and electro-scope to be on the outside of the bag. On turning itinside out the electricity…
Electricity · Magnetism
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