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Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
Southern Historical Society Papers, Volume 12. (ed. Reverend J. William Jones) 2 2 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
actical application to illuminating purposes. The lights of the natural lanterns carried by fireflies, glow-worms, and some species of nocturnal moths, may be considered as electric lights. Though classed as phosphorescent, some of them are intermittent, and we suppose the nervous action by which they are flashed into brilliancy to be in the nature of what we call a voltaic impulse from the battery. — the brain. The electric light was first brought into notice in 1846. The patent of Greener and Staite of that year embraced an arrangement whereby small lumps of pure carbon, inclosed in air-tight vessels, were rendered luminous by currents of galvanic electricity. Two small cylinders or bits of pure carbon were placed nearly in contact with their points toward each other, and maintained at a constantly equal distance apart by means of clockwork, which slowly advanced them as they were consumed by combustion. Through these the current of a galvanic battery was transmitted, so t