Flame, electricity and the camera; man's progress from the first kindling of fire to the wireless telegraph and the photography of color (1900)
Iles, George, 1852-1942 · New York, Doubleday & McClure co. · leaf 264
s a current fromB, a battery and inductioncoil, to 5 and T, two brassspheres about three inchesin diameter, and mounteda small distance apart.The spark which, duringthe depression of the keyK, passes between thespheres, sends forth theelectric waves which bearthe signal afar. C is thecoherer at the… … Fig. 72.Marconi telegraph apparatus. chain, the coherer, when unexcited, forms a link whichobstructs the flow of a current eager to leap across. Theinstant that an electric wave from the sending-station im-pinges upon the coherer it becomes conductive; the cur-rent instantly glides through it, and…
Fire · Electricity · Color photography
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