HANDBOOK OF ACOUSTICS - online book

A complete view of Acoustical Science & its bearings on music, for musicians & music students.

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RESONANCE.
65
A Eesonator is a vessel of varying shape and material, and of such dimensions, that the air contained in it resounds, when a note of a certain definite pitch is sounded near it. Resonators are most commonly constructed of glass, tin, brass, wood, or cardboard. The forms most often met with are the cylindrical, spherical, and conical. Their use is to enable the ear to distinguish a sound of a certain pitch, from among a variety of simultaneous sounds, of different pitches. The only essential, therefore, in the construction of a resonator is, that the mass of air which it encloses shall resound to the note which it is intended to detect. The best form for a resonator designed for accurate scientific work is the spherical, as it then reinforces only the simple sound to which it is tuned. The
Fig. 37.
spherical resonators employed by Helmholtz in his researches, were of glass, and had two openings as shown in fig. 37. The opening on the left hand serves to receive the sound waves coming from the vibrating body, the other opening is funnel shaped and is to be in-
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