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Updated: May 10, 2025
He brought Bell to his house and showed him what Helmholtz had done how he had kept tuning-forks in vibration by the power of electro-magnets, and blended the tones of several tuning-forks together to produce the complex quality of the human voice. Now, Helmholtz had not been trying to invent a telephone, nor any sort of message-carrier.
To understand the theory, one must think of all matter as composed of minute isolated particles or molecules, which are always in motion vibrating, if you will. He must mentally magnify and visualize these particles till he sees them quivering before him, like tuning-forks held in the hand.
The prongs of the big tuning-forks continued to vibrate strongly, and gave out in unison the loud, humming note that had originally attracted Constans's attention. It was undoubtedly, a form of motor whose power was derived from some secret property of vibratory bodies, a recondite subject to which his books alluded but obscurely.
Fiddles, sand-patterns, colored robes, gongs, giant tuning-forks, wax-sheeted walls, aged-faces-turned-young and caverns-by-the-sea jostled one another in his memory with a jumble of disproportion quite inextricable. Next, impelled by that driving sense of duty to Skale, he turned to the girl at his side: "Can you do it?" he cried.
I have seen one which was carefully concealed in a box that had a leather binding like a book, and which was ostentatiously labelled in large gilt letters "Holy Bible;" a piece of barefaced and unnecessary deception on the part of some pious New England deacon or chorister. Little wooden fifes were also used, and then metal tuning-forks.
He had to devise his own governors for the synchronous mechanism, and here his knowledge of acoustics helped him. Centrifugal governors and pendulums would not do, and he tried vibrators, such as piano-strings and tuning-forks. He at last found what he wanted in two darning needles, borrowed from an old lady in the house where he lived.
Deacon Marsden, he don't believe in anything above tuning-forks, and he's tighter'n the bark on a bulldog. He stood out like a sore thumb, and Dad wouldn't give an inch. "You see, they held meetings every other Sunday. So Dad worked up the organ business and got one, and then locked it up when the Baptists held their services. Things went from bad to worse.
The steamers, resounding like gigantic tuning-forks, state the old old fact how there is a sea coldly, greenly, swaying outside.
He had made no little progress with sound, and demonstrated to Bell the methods by which German scientists had caused tuning-forks to vibrate by means of electro-magnets and had combined the tones of several tuning-forks in an effort to reproduce the sound of the human voice.
The most familiar illustration of the interference of sound-waves is furnished by the beats produced by two musical sounds slightly out of unison. When two tuning-forks in perfect unison are agitated together the two sounds flow without roughness, as if they were but one. But, by attaching with wax to one of the forks a little weight, we cause it to vibrate more slowly than its neighbour.
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