Elementary lessons in electricity & magnetism (1895)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · New York and London, Macmillan and co. · leaf 62
sparks 4 inches long when the knuckle ispresented to the knob, it will be found that, on fasteninga fine pointed needle to the conductor, it discharges theelectricity so effectually at its point that only the shortestsparks can be drawn at the knob, while a fine jet or brushof pale blue light will… … Fiff. 34. felt with the hand. They are due to a mutual repulsionbetween the electrified air particles near the point andthe electricity collected on the point itself. That thismutual reaction exists is proved by the electric fly orelectric reaction-mill of Hamilton (Fig. 35), which con-sists of a…
Electricity
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