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 113
Fie. 50. Fig. 51. their mutual friction the particles of the two powders become elec-trified, the red-lead positively and the sulphur negatively, and theyconsequently attach themselves to parts of the surface of the resinwhich have been electrified in the opposite way to themselves.The lines formed…
Electricity · Magnetism
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