HANDBOOK OF ACOUSTICS - online book

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

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68                      HAND-BOOK OF ACOUSTICS.
A Resonator is an open vessel of glass, metal, cardboard, or other material, of such dimensions, that the mass of air contained in it resounds to a note of a certain pitch. Its use is, to assist the ear in discriminating a sound of this particular pitch, from a number of others at different pitches, all sounding simultaneously.
In order that a column of air, in a cylindrical tube open at both ends, may vibrate in unison with a given sound, the length of the tube must be approximately one half the length of the correspond­ing sound wave.
If the tube be closed at one end, its length must be one-fourth that of the sound wave.
In both cases the diameter of the tube should not exceed one-sixth the length.