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 34
rods, are carried up inside the bell-jar so that their upper endsare a little above the bottom of the strips of gold-leaf. When the electroscope is entirely unelectrified, the two gold-leaves hang vertically face to face ; but a very small degree ofelectrification causes them to stand apart at the… … Fig. 7. 12 LAW OF INVERSE SQUARES [11- of the gold-leaves results from the tendency of the boundaries ofthe field to approach each other. 2. The proof-plane consists of a small disc of copper-foil or ofgilt cardboard fastened at the end of an insulating rod of shellacor glass. If the disc iS…
Electricity · Magnetism
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