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 33
4indrical glass case … Fig. 9. by means of a fine silver wire. At one end this lever isfurnished with a gilt pith-ball, n. The upper end of thesiher wire is fastened to a brass top, upon which a circle,divided into degrees, is cut. This top can be turnedround in the tube which supports it, and is known as…
Electricity · Magnetism
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