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Updated: May 18, 2025
But if the listener knows when it sounds right he knows it entirely separate and apart from any knowledge he may have of its scientific construction; hence such knowledge is of no value whatever in determining what is good and what is bad in tone quality. A tone is not a thing to see and the teacher cannot use a camera and a manometric flame in teaching tone production.
Perhaps the most interesting feature of the mechanism was that the Ring appeared to have automatic stability, for the angle of the direction in which the tractor was pointed was controlled not only by a pair of gyroscopes which kept the Ring on an even keel, but also by a manometric valve causing it to fly at a fixed height above the earth's surface.
Then, in the early Summer of 1874, while he was puzzling over this harp apparatus, the dim outline of a new path suddenly glinted in front of him. He had not been forgetful of "Visible Speech" all this while, but had been making experiments with two remarkable machines the phonautograph and the manometric capsule, by means of which the vibrations of sound were made plainly visible.
It is known, of course, that in this case the manometrical pressure must be regarded as very great in relation to the internal pressure which, in the characteristic equation, is added to the other. May it not seem possible that in the solution it is, on the contrary, the internal pressure which is dominant, the manometric pressure becoming of no account?
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