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 262
its small weight inter-feres but little with its tendency to set itself with its axis alongthe direction of the field, and it thus approaches the condition of a freely movable mag-net. If a sheet of glassor smooth cardboard islaid above a bar magnet,and iron filings aresprinkled uniformly overit,… … Fig. 156. cardboard is gently tapped, the friction of the particles of iron ismomentarily overcome and their magnetic arrangement is facili-tated. In this way the magnetic field is visibly mapped out.Figs. 156 and 157, which, like Fig. 155, are from photographs ofactual figures made with filings,…
Electricity · Magnetism
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