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 132
akes place in sunlight than in darkness from thesurfaces of the earth, which is composed of mineral particlescharged, as the positive sign of the slope of atmosphericpotential indicates, with negative electricity. It seems to us evident that there exists a direct electricaction of sunlight upon the… … Fig. 63.Explanation of Fig. 63.—Arrangement used by Elster and Geitel for ex-posing various phosphorescent minerals to daylight, while under inductivecharge. They were put in powder in the tray P, and the transparent wire-gauze N above them was charged positively from a battery. The metalcover MM…
Electric waves · Telegraph, Wireless · Electricity · Wireless Technology
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
