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Updated: June 1, 2025
In these two words, effective vibrations, lies the whole secret of voice production, the whole purpose of training, the key to the highest technical results, the cause of success or failure for those who speak or sing. Before the larynx, the apparatus that produces sound-vibrations, can be effectively employed, the source of power, the bellows, must be developed.
"For what we hear as sound is only a section," he cried, "only a section of sound-vibrations as they exist."
In these three Plates only the form created directly by the sound-vibrations has been drawn, though as seen by the clairvoyant it is usually surrounded by many other minor forms, the result of the personal feelings of the performer or of the emotions aroused among the audience by the music.
As we have seen, those electricians who worked from the viewpoint of the telegraph never got beyond the limitations of the instrument and found that with it they could transmit signals but not sounds. Bell, with his knowledge of the laws of speech and sound, started with the principles of the transmission of sound as a basis and set electricity to carrying the sound-vibrations.
"That," he cried aloud, to the further astonishment and even alarm of his companion, "is another part of my discovery an essential particular of it: the production of sound-vibrations fine and rapid enough to alter shapes! Listen and I will tell you!" He lowered his voice again.
His plan was to transmit the vibrations over the wire and have the voice reproduced by the vibrations of the strings of the harp. By attaching a light pencil or marker to a cord or membrane and causing the latter to vibrate by talking against it, he could secure tracings of the sound-vibrations. Different tracings were secured from different sounds.
To the philosophic mind, however, they are not playing or singing; they are producing and controlling sound-vibrations, arbitrarily varied in duration and quality; a series of such pulsations constituting a note; a series of notes constituting an air. Such, however, is the scientific analysis of music. Spoken language appeals by the same process, but with very different effect.
It was the part to receive the sound-vibrations occasionally propagated through the water; the part to be affected more strongly than any other by those variations in the amounts of light caused by the passing of small bodies close to it; and the part which met those diffused molecules constituting odours.
He thought of connecting two such instruments with an electrified wire, one of which would receive the sound-vibrations and the other of which would reproduce them after they had been transmitted along the wire. At last the experimenter was on the right track, with a conception of a practicable method of transmitting sound.
We have fairly trustworthy evidence that whales communicate with each other by notes so low in pitch by sound-vibrations so long in range, so few per second that no human ear can detect them. Bats, on the other hand, utter calls so high-producing such rapid pulsations as to be equally inaudible to us
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