Signalling through space without wires : being a description of the work of Hertz & his successors (1900)
Lodge, Oliver, Sir, 1851-1940, Hertz, Heinrich, 1857-1894 · London : "The Electrician" Printing and Publishing Company, Limited · leaf 18
A and B Sparks; Glass and Quartz Panes in Screen.While Hertz was observing sparks such as these, the primaryor exciting spark and the secondary or excited one, he observedas a bye issue that the secondary spark occurred more easily ifthe light from the primary fell upon its knobs. He examinedthis… … Fio. 7.—Experiment arranged to show effect on one spark of light fromanother. The B spark occurs more easily when it can see the A sparkthrough the window, unless the window is glazed with glass. A quartzpane transmits the effect: glass cuts it off. The above figure represents my way of showing the…
Electric waves · Telegraph, Wireless · Electricity · Wireless Technology
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
