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Updated: May 15, 2025
Thus, from your every-day experience you have proof of two important facts, first, sound is caused by rapid motion; second, sound-waves give rise to corresponding motion. Both these facts are involved in the speaking telephone, which performs a twofold office, that of the ear on the one hand, that of our vocal organs on the other.
These impulses, according to Bell's theory, correspond in form to the sound-waves, and passing over the line energize the magnet coil at the receiving end, and by varying the magnetism cause the receiving diaphragm to be similarly vibrated to reproduce the sounds. A single apparatus is therefore used at each end, performing the double function of transmitter and receiver.
There is an echo in Woodstock Park which repeats the word twenty times. Again sometimes, as in the Alps, the sound-waves coming back rebound from mountain to mountain and are driven backwards and forwards, becoming fainter and fainter till they die away; these echoes are very beautiful.
In this way sound-waves similar to those caused by the original sounds would be set up in the air, thus reproducing the original speech. The modern phonograph operates in a precisely similar way, the only difference being in details of refinement.
By now, he was consistently identifying himself with the latter. He took to carrying one of the thick-barrelled stun-pistols always, now. Alone, he practiced constantly with it, drawing, breaking soap-bubbles with the concentrated sound-waves it projected. It was silly, perhaps, but it helped him in his dreams.
You remember learning how light is turned back or reflected. Just as the light-waves come back again, so do the sound-waves; very quickly if the reflecting surface is near; after some time if it is far off. You know what an echo is. There is a lovely place where some children I know used often to go for a picnic.
I account for this by saying that it has taken some time for the sound-waves to reach my ear, and I regard my sensation as arising only when this has been accomplished. But this conclusion is not judged sufficiently accurate by the man of science. The investigations of the physiologist and the psychologist have revealed that the brain holds a peculiar place in the economy of the body.
In the endeavour to conceive it, the origin of sound-waves has been in mind, where longitudinal air-waves are produced by the vibrations of a sounding body, and molecular impact is the antecedent of the waves. The analogy does not apply. The following exposition may be helpful in grasping the idea of such transformation and change of energy from matter to the ether.
The film had not brought good results, either from sound-waves or light-waves, but, it will be remembered, there were wires running through it to give it rigidity, which, although necessary in my original experiments, must be avoided in connection with sound vibrations. Clearly my new film must not be rigid.
There we hear it, because it rubs the leaves together, and they produce the sound-waves. But walk against the wind some day and you can hear it whistling in your own ear, striking against the curved cup, and then setting up a succession of waves in the hearing canal of the ear itself.
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