Tyndall, John, 1820-1893 · New York : Appleton · leaf 94
Thelowering of the intensity of a note does not thereforeimply the lowering of its pitch. In fact, though theamplitude changes, the rate of vibration remains the same.Pitch and intensity must therefore be held distinctlyapart; the latter depends solely upon the amplitude, theformer solely upon the… … a point. When the tuning-fork is excited it vibrates,and the strip of metal accompanies it in its vibration.The point of the strip being brought gently down upon apiece of smoked glass, it moves to and fro over the smokedsurface, leaving a clear line behind. As long as the handis kept motionless,…
Sound
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