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Updated: May 15, 2025
You do not only hear the water dashing against the rocky ledges or on the beach, you also hear the bursting of innumerable little bladders of air which are contained in the water. As each of these bladders is dashed on the ground, it explodes and sends sound-waves to your ear.
It should be noted here that the activity aroused in the mind of the receiving person is accomplished by the setting into vibratory motion the Chitta or Mind-substance of that person, just as the receiving diaphragm of the telephone is set vibrating at the same rate as that of the sending instrument, and thus the original sound-waves are reproduced. Thought Waves
Snakes "hear," or catch the sound-waves, with their flickering, forked tongues; and grasshoppers and locusts have "ear-drums" on the sides of their chests. These are called the recti or "straight" muscles, upper, lower, inner, and outer, according to their position.
I had so much to occupy my mind, with what I had just witnessed, and so many thoughts rushed in upon me regarding the perfecting of my instrument so that it might properly respond to the sound-waves, that I did not experience the disappointment I had felt before at the short duration of our contact with each other.
Why should it sound in one particular tone when all kinds of sound-waves must be surging about in the disturbed air? This glass jar will answer our question roughly.
Resting on the cylinder was a palladium-faced pen or spring, which was attached to a mica diaphragm in a resonator. The current passed from the main line through the pen to the chalk and to the battery. The sound-waves impinging upon the distant transmitter varied the resistance of the carbon button therein, thus causing corresponding variations in the strength of the battery current.
Each of these blows makes a small globe of sound-waves, which spread and spread till they fall on your ear, and because they fall quickly and regularly, they make a low, musical note. We might almost fancy that the brook wished to show how joyfully it flows along, recalling Shelley's beautiful lines:
Could you see the air through which sound-waves are passing, you would observe every individual particle of air oscillating to and fro, in the direction of propagation.
If the sound-waves produced at the time of maximum eruption were not quite as far-reaching as those of the air, they were certainly sufficiently surprising to be almost incredible, were it not that they rest, both as regards time and character, upon incontestible authority.
"With all the other feats of skill and sorcery you have accomplished, why don't you reconstruct their speech, also?" asked Crane, with a challenging glance. "Well, old Doubting Thomas, it might not be absolutely impossible, at that. It would mean two projectors, however, due to the difference in speed of sound-waves and light-waves.
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