Signalling through space without wires : being a description of the work of Hertz & his successors . Fig. 2.—Oscillation of Ring-shaped Hertz Resonator excited by SyntonicVibrator (after Bjerknes). motion which it originated the previous moment. Whereas,if it is a dead-beat or strongly-damped exciter, almost any-thing will respond equally well or equally ill to it. What I have said of sounding bodies is true of all vibratorsin a medium competent to transmit waves. Now a sendingtelephone or a microphone, when spoken to, emits waves into. Fig. 3.—Oscillation of Ring Resonator not quite syntonic
Signalling through space without wires : being a description of the work of Hertz & his successors . Fig. 2.—Oscillation of Ring-shaped Hertz Resonator excited by SyntonicVibrator (after Bjerknes). motion which it originated the previous moment. Whereas,if it is a dead-beat or strongly-damped exciter, almost any-thing will respond equally well or equally ill to it. What I have said of sounding bodies is true of all vibratorsin a medium competent to transmit waves. Now a sendingtelephone or a microphone, when spoken to, emits waves into. Fig. 3.—Oscillation of Ring Resonator not quite syntonic with Radiator.(For method of obtaining these curves see Fig. 14.) the ether, and this radiant energy is likewise able to set upvibration in suitable bodies. But we have no delicate meansof directly detecting these electrical or etherial waves ; and ifthey are to produce a perceptible effect at a distance, theymust be confined, as by a speaking-tube, prevented fromspreading, and concentrated on the distant receiver. WORK OF HERTZ LECTURE. 5 This is the function of the telegraph wire; it is to the etherwhat a speaking-tube is to air. A metal wire in air (in functionfnot in details of analogy) is like a long hollow cavity surroundedby nearly rigid but slightly elastic walls. Sphere charged from Elect , any conductor electrically charged or dischargedwith sufficient suddenness must emit electrical waves into theether, because the charge given to it will not settle downinstantly, but will surge to and fro severa
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