Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 35
canbe tested and proved to exist. 36 ELEMENTARY ELECTRICITY The same idea may be carried out with a scrap of silkand a glass rod. Question 10. How do you test to prove a charge ex-ists ? Answer. By using an electroscope. Question 11. Describe an electroscope. Answer. As shown in Fig. 4 and in Fig.… … Fig. 8. Charging an Electroscope by Influence. Two strips of foil are often pasted on the sides of thejar to discharge the foil leaves if they swing out too far. Question 12. How do you prepare an electroscope fora test? Answer. Rub a glass rod with a piece of silk and holdrod near the ball of the…
Electricity
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