Signalling through space without wires : being a description of the work of Hertz & his successors . Any circular Resonator can be used as a sender by bringing itsknobs near the sparking knobs of a coil ; but a simple arrangement is totake two semi-circles, as in above figure, and make them the coil capacity of the cut ends can be varied, and the period therebylengthened, by expanding them into plates. what would have been to most physicists a confusing maze oftroublesome facts, and disentangling all their main relationsmost harmoniously. WORK OF HERTZ LECTURE. 9 Roltz Machine, A
Signalling through space without wires : being a description of the work of Hertz & his successors . Any circular Resonator can be used as a sender by bringing itsknobs near the sparking knobs of a coil ; but a simple arrangement is totake two semi-circles, as in above figure, and make them the coil capacity of the cut ends can be varied, and the period therebylengthened, by expanding them into plates. what would have been to most physicists a confusing maze oftroublesome facts, and disentangling all their main relationsmost harmoniously. WORK OF HERTZ LECTURE. 9 Roltz Machine, A and B Sparks; Glass and Quartz Panes in 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 new influence of light in many ways, and showed thatalthough spark light and electric brush light were peculiarlyeffective, any source of light that gave very ultra-violet raysproduced the same Fio. 7.âExperiment 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 experi-ment. It will be observed that with this arrangement the Bknobs are at the same potential up to the instant of the flash,an<T in that case the ultra-violet portion of the light of the Aspark pssists the occurrence of the B spark. But it is interest-ing to note what Elster and Geitel have found (see Appendix IV.,Fig. 59), that if the B knobs were subjected to steady straininstead of to impulsive rushâ, if they were connected to 10 SIGNALLING WITHOUT WIRES. the inner coats of the jars instead of the outer coatingsâthatthen the effect of ultra-violet light on either spark-gap wou
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Keywords: ., bookcentury1900, bookdecade1900, bookidsi, booksubjectelectricity
