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 105
upon the screen, but if both were allowed to pass, thescreen at regular inter-vals became dark. Twoportions of light haddestroyed each otherthrough the coincidenceof a crest and a trough,as in the case of thewater-waves (Fig. 21).Young from this concluded that light must be merely amotion, and not… … Fig. 21.Interference of licrht-waves. ETHER DISCOVERED 81 through which light and heat take their way is a substance,though of a tenuity so extreme as to be next to nothing.Professor de Volson Wood computed that a mass of it aslarge as the earth would weigh but 1.7 pounds. LordKelvin tells us that…
Fire · Electricity · Color photography
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