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7Some one may perchance urge, that many theatres are yearly built in Rome, without any regard to these matters. But let him not be herein mistaken, inasmuch as all public theatres which are constructed of wood, have many floors, which are necessarily conductors of sound. This circumstance may be illustrated, by consideration of the practice of those that sing to the harp, who when they wish to produce a loud effect, turn themselves to the doors of the scene, by the aid of which their voice is thrown out. But when theatres are constructed of solid materials, that is of rubble, squared stones or marble, which are not conductors of sound, it is necessary to build them according to the rules in question.
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