Elementary lessons in electricity & magnetism (1895)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · New York and London, Macmillan and co. · leaf 38
ophorus was announced in 1775. Its principle hadalready been anticipated by Wilcke, who in 1762 described to the SwedishAcademy of Sciences two charging-machines working by influence. 30 ELECTRICITY AND MAGNETISM part i requires occasional washing with ammonia and rubbingwith paraffin oil, as the… … Fig. 20. skin. The disk or cover is then placed upon the cake,touched momentarily with the ringer, then removed bytaking it up by the glass handle, when it is found to bepowerfully electrified with a positive charge, so much soindeed as to yield a spark when the knuckle is presentedto it. The cover…
Electricity
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