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 79
Fig. 172. … Fig. 173. and its lower strip of tin-foil connectedwith the earth. When the machine isworked, sparks pass between the knoband the projecting arm. In a dark room,the metallic powder coat will be beauti-fully illuminated at the passage of eachsuch spark. Experiment 67.—The Muminouspane is represented…
Electricity · Magnetism
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