Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 32
n upright.When the whole is electrified thepith-ball is repelled from the up-right and flies out at an angle,indicated on a graduated scale orquadrant behind it. Its usual foimis shown in Fig. 8. This littleelectroscope, which is seldomused except to show whether anelectric machine or a… … Fig. 8. CHAP. I,] ELECTRICITY AND MAGNETISM. 15 15. The Torsion Balance.—Although more pro-perly^ an Electrometer than a mere Electroscope^ itwill ^ be most convenient to describe here the instrumentknown as the Torsion Balance. (Fig. 9.) Thisinstrument serves tomeasure the force of therepulsion…
Electricity · Magnetism
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