The Ten Books on Architecture, 5.5.2

Vitruvius  translated by Joseph Gwilt

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2The following is the rule for determining the situations of these vases. If the theatre be of moderate size they must be ranged round at half its height. Thirteen cavities are prepared at twelve equal distances from each other, so that those tones above-named, producing netè hyperbolæon, are to be placed in the cavities at the extreme ends; second, from the ends, the vessels are to be of the pitch of netè diezeugmenon, bearing an interval of one fourth from the last mentioned. The third netè paramesôn, an interval of another fourth. The fourth, netè synemmenôn, another fourth. The fifth, mesè, a fourth. The sixth, hypatè mesôn, a fourth: in the centre of the range, hypatè hypatôn, a fourth.

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