Flame, electricity and the camera; man's progress from the first kindling of fire to the wireless telegraph and the photography of color (1901)
Iles, George, 1852-1942 · New York, Doubleday & McClure co. · leaf 264
und the surfaceof such obstructions very much as waves of sound and ofwater would do. It is singular how discoveries sometimes arrive abreastof each other so as to render mutual aid, or supply a press-ing want almost as soon as it is felt. The -^aAAA/^^^ -*aAA/\Aa/ coherer in its present -p form is… … Fig. 74.Wehnelt interrupter. cidedly longer (Fig. 73). What is needed is a plan by whichthe waves may flow either continuously or so near togetherthat they may lend themselves to attuning. Dr. Wehnelt, byan extraordinary discovery, may, in all likelihood, providethe lacking device in the form of…
Fire · Electricity · Color photography
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