Elementary treatise on electricity and magnetism : founded on Joubert's "Traité élémentaire d'électricité" (1909)
Foster, G. Carey (George Carey), Porter, Alfred William, 1863-1939, Joubert, Jules François · London : Longmans · 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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