William Watson Electrical Demonstrations, 1748
Watson's electrical system comprised the generator C turned by a wheel and crank. The charge, caused by a dry hand is drawn by the feet of the boy suspended by silk ropes, and transmitted to the girl standing on a tub of dried pitch, whose hand attracts and repels some chaff H. Fig. 2 shows two bells and a clapper hung from a silk thread. A charge drawn from the electrified gun-barrel T causes alternate attraction and repulsion of the clapper and a "jingling of the two bells". Illustration taken from "Expericences et Ovservations, pour servir a l'Explication de la Nature et des Proprietes de l'Electricite" by William Watson, 1748.
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