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 109
an- level surfaceunited and let fall upon a screen. If either ray werestopped, the other shone forth upon the screen, but if both were allowed to pass, thescreen at regular inter-vals 1 in.ime dark. Twoportions of light haddestroyed each otherthrough the coincidenceoi a crest and a trough,as in the… … Fig. 21.Intei ference <>f light-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…
Technology · Fire · Electricity · Photography
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
