Elementary treatise on electricity and magnetism (1903)
Foster, George Carey, 1835-1919, Joubert, Jules François, 1834-1910. Traité élémentaire d'électricité, Porter, Alfred William, 1863- joint author · London, New York, Longmans, Green, and co. · leaf 153
in which a portrait ofFranklin is cut out; onthe other side is placeda white silk ribbon, c,and the whole is stronglyclamped between two slipsof wood, p. When a dis-charge is passed, the goldis volatilised, its vapourspass through the parts cut out, and reproduce the design in a violet-brown colour… … Fig. 79.
Electricity · Magnetism
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