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 23
Fig. 11.—A Small Dumb-bell Form of Radiator for Impulsive Rush. Many of these senders will do for receivers too, giving offsparks to other insulated bodies or to earth ; but besides theHertz type of receiver, many other detectors of radiation have … Fig. 12.—Dr. Lodges Hollow Cylindrical Radiator, arranged horizontallyagainst the outside of a Metal-lined Box containing the Spark-producingApparatus. Half natural size. Emitting 3in. waves. been employed. Vacuum tubes can be used, either directlyor on the trigger principle, as by Zehnder (Fig.…
Electric waves · Telegraph, Wireless · Electricity · Wireless Technology
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