Elementary lessons in electricity & magnetism (1895)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · New York and London, Macmillan and co. · leaf 24
roscopes.There are, however, a number of pieces of apparatusbetter adapted for this particular purpose, some of whichwe will describe. 15. Needle Electroscope. — The earliest electroscopewas that devised by Dr. Gilbert, and shown in Fig. 11,which consists of a stiff strip balanced lightly upon… … Fig. 11. the electroscope it is attracted and turned round, and willthus indicate the presence of electric charges far too feebleto attract bits of paper from a table. 16. Gold-Leaf Electroscope. — A still more sensi-
Electricity
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