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 240
Fig. 61. Reflecting galvanometer. L, lamp; AT, moving spot of light reflected from mirror. On the same plan, the extremely minute motion of a gal-vanometer, as it receives the successive pulsations of amessage, is magnified by a weightless lever of light so that 2o6 CABLE TELEGRAPHY
Fire · Electricity · Color photography
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