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 111
xide. Amongst the manymeasurements made, I found, in one case, a resistance of80,000 ohms, which, after exposure to the influence of theelectric spark, was reduced to 7 ohms. Analogous effects areobtained with oxidised steel rods. Another pretty experimentis to place a cylinder of copper, with an… … Fig. 56. merely moving the cylinder from one place to another on theoxidised sheet of copper, thus showing that the phenomenononly takes place at the point of contact of the two layers ofoxide. In conclusion, it may be worth noting that, for most of thesubstances enumerated, an elevation of…
Electric waves · Telegraph, Wireless · Electricity · Wireless Technology
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