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Helmholtz Resonators

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  P-232

2025-11-20

513

Are spherical shells, of various sizes, each having at one side a short tube to receive the sound and directly opposite a smaller tube which is held to the ear. Each resonator will increase the loudness of a tone of some particular pitch only, whether that tone is a fundamental or an overtone. These instruments were devised by Helmholtz, and by their use he discovered just which overtones are present in the sounds of various musical instruments.

A modified form of Helmholtz resonator is shown in Fig. 1. This consists of two tubes, one of which slides within the other so that the instrument can be adjusted to tones of varying pitches. The flexible tube is connected to the manometric flame apparatus, and by this means the character of the vibrations present is determined. By combining sounds giving all the different vibrations observed, it is possible to reproduce a sound having the same quality as the original.