Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 170
m, fig. 72 c. Inthis way the disc may be subdivided into ten, twelve,fourteen, sixteen sectors, the number of sectors beingalways an even one. As the division becomes more minutothe vibrations become more rapid, and the pitch conse-quently more high. The note emitted by the sixteensegments into… … previously seen. By rendering the centre of the discfree, and damping appropriate points of the surface, nodalcircles and other curved lines may be obtained. The rate of vibration of a disc is directly proportionalto its thickness, and inversely proportional to the squareof its diameter. Of the…
Sound
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