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3By the adoption of this plan, the voice which issues from the scene, expanding as from a centre, and striking against the cavity of each vase, will sound with increased clearness and harmony, from its unison with one or other of them. If, however, the theatre be on a larger scale, the height is to be divided into four parts, so that three ranges of cavities may be provided, one for harmonic, the second for chromatic, and the third for diatonic vases. That nearest the bottom is for the harmonic genus as above described, for a lesser theatre.
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