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 22
Toshow this repulsion better,let a small piece of featheror down be hung by a silkthread to a support, andlet an electrified glass rodbe held near it. It willdart towards the rod andstick to it, and a momentlater will dart away fromit, repelled by an invisibleforce (Fig. 4), nor will itagain dart… … Fig. 4. CHAP. I. J ELECTRICITY AND MAGNETISM. toward the hand, as the rubbed body in Fig. 3 did.This proves that the feather, though it has not itselfbeen rubbed, possesses the property originally imparted tothe rod by rubbing it. In fact, it has become electrified,by having touched an electrified…
Electricity · Magnetism
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