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 20
Dr. Gilbertof Colchester discovered by experiment that not only i& B ^ ELEMENTARY LESSONS ON [chap. i. amber and jet, but a very large number of substances,such as diamond, sapphire, rock-crystal, glass, sulphur,sealing-wax, resin, etc., which he styled electrics^possess the same property. Ever… … Fig. I. 2. A better way of observing the attracting force isto employ a small ball of elder pith, or of cork, hung bya fine thread from a support, as shown in Fig. 2. Adry warm glass tube, excited by rubbing it briskly witha silk handkerchief, will attract the pith ball strongly,showing that it is…
Electricity · Magnetism
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