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Updated: May 28, 2025
Hold a ticking watch between the teeth, or touch the upper incisors with a vibrating tuning-fork; close both ears, and observe that the ticking or vibration is heard louder. Unstop one ear, and observe that the ticking or vibration is heard loudest in the stopped ear. Experiment 159. Hold a vibrating tuning-fork on the incisor teeth until you cannot hear it sounding.
Why, there are benches for the men and a pulpit for Israel. As for Jacob, he has nothing but his tuning-fork and a seat with the rest. "And indeed there's more chance that Israel will put a stop to the Free-trading than all the preventives in the land. He preaches against it, declaring that it makes the young men fit for nothing else, like every other way of making money without working for it."
Then the two landsmen cowered involuntarily, and looked in each other's eyes with a wild surmise, for a shock came which made the vessel quiver like a tuning-fork in every fibre; the very pannikins on the cabin floor rattled, and all the things in the pantry went like rapidly chattering teeth. It was not like an ordinary blow of the sea.
This tuning-fork produces a sound which, by exciting our retina, gives us a sense of movement. This visual sensation of vibration is a purely subjective one, the external cause of the phenomenon is the sound. The outer world is a concert of sounds which rises in the immensity of space. Matter is noise and nothingness is silence."
Helmholtz had performed this experiment simply to demonstrate the physical basis of sound, and seems to have had no idea of its possible use in telephony. That an electro-magnet could vibrate a tuning-fork and so produce sound was an entirely new and fascinating idea to the youth. It appealed to his imagination, quickened by his knowledge of speech.
We see, parallel to each other, two different orders of phenomena; the visual phenomena which show us that the tuning-fork is vibrating, and the auditory phenomena which convey to us the fact that it is making a sound.
And when Harry had struck the tuning-fork, they began to sing together, "O little town of Bethlehem, How still we see thee lie! Above thy deep and dreamless sleep The silent stars go by." The twenty-fourth had been a good day for business in Tim Shartow's place.
The cavity then is a resonance-chamber for the fork, and thus intensifies its sound; in other words, the air in the mouth cavity vibrates in harmony with the tuning-fork.
It demands a great effort to clear our minds of these familiar conceptions which, it is plain are nothing but naïve realism. Yes! the mechanical conception of the universe is nothing but naïve realism. To recapitulate our idea, and, to make it more plain by an illustration, here is a tuning-fork on the table before me. With a vigorous stroke of the bow I set it vibrating.
The chief joy of his life was an old tuning-fork that the teacher of the singing school had given him, but, owing to the degrading and arbitrary censorship of pockets that prevailed, he never dared bring it into the schoolroom. There were ways, however, of evading inexorable law and circumventing base injustice. He hid the precious thing under a thistle just outside the window.
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