Signalling through space without wires : being a description of the work of Hertz & his successors . , p. 27. b2 SIGNALLING WITHOUT WIRES. If, on the other hand, the receiving body has a persistentperiod of vibration, continuing in motion long after it is leftto itself (Fig. 2) like another tuning-fork or bell, for instance,then far more facility of response exists, but great accuracy oftuning is necessary if it is to be fully called out; for if thereceiver is not thus accurately syntonised with the source,it fails more or less completely to resound. Conversely, if the source is a persis
Signalling through space without wires : being a description of the work of Hertz & his successors . , p. 27. b2 SIGNALLING WITHOUT WIRES. If, on the other hand, the receiving body has a persistentperiod of vibration, continuing in motion long after it is leftto itself (Fig. 2) like another tuning-fork or bell, for instance,then far more facility of response exists, but great accuracy oftuning is necessary if it is to be fully called out; for if thereceiver is not thus accurately syntonised with the source,it fails more or less completely to resound. Conversely, if the source is a persistent vibrator, correcttuning is essential, or it will destroy at one moment (Fig. 3). 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
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