. The science-history of the universe . Fig. 48 -Preeces Apparatus for Signaling by Electro-magnetic Induction. placed at a distance from a spark discharge of a Leydenjar, minute sparks would pass across the air-gap of theloop, thus indicating the presence of electric waves. Hesubsequently made a very complete study of the behaviorof these waves and thus gave a tremendous impetus tothe development of wireless telegraphy. Second to the work of Hertz is that of Sir OliverLodge, who in 1889 discovered the effect of electric waveson the breaking down of the electrical resistance of twoknobs barely
. The science-history of the universe . Fig. 48 -Preeces Apparatus for Signaling by Electro-magnetic Induction. placed at a distance from a spark discharge of a Leydenjar, minute sparks would pass across the air-gap of theloop, thus indicating the presence of electric waves. Hesubsequently made a very complete study of the behaviorof these waves and thus gave a tremendous impetus tothe development of wireless telegraphy. Second to the work of Hertz is that of Sir OliverLodge, who in 1889 discovered the effect of electric waveson the breaking down of the electrical resistance of twoknobs barely in contact, which discovery resulted in thefirst means used to detect the presence of electrical waves,viz., the coherer. 314 ELECTRICITY The development of wave detectors is an importantchapter. For these instruments Professor Fleming hassuggested the use of the word cymoscope as a generalterm including all classes of wave detectors. A greatnumber of these have been-invented, but they may allbe included under the following classes: i
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