Elementary lessons in electricity & magnetism (1895)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · New York and London, Macmillan and co. · leaf 69
inrotation briskly. If it is clean it should excite itselfafter a couple of turns, and will emit a gentle hissingsound, due to internal discharges (visible as blue glimmersin the dark), aud will offer more resistance to turning.If then the knobs are pushed nearer together sparks willpass across… … Fig. 35. of the jars. These are convenient for attaching wires tolead away discharges for experiments at a distance. Ifnot so used they should be joined together by a shortwire, as the two jars will not work properly unless theirouter coatings are connected. 52. Wimshursts Influence Machine. — In…
Electricity
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