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4Since, therefore, this is the case, it does not seem foreign to our purpose, carefully and diligently to explain those principles on which a work should be formed previous to commencing it. But as neither the law nor custom compels the adoption of such a practice, and the prætors and ædiles are bound every year to provide the machinery for the sports, it appeared to me, O Emperor, highly expedient, as in the foregoing books I have treated on buildings, to explain in this which closes the treatise, the principles upon which such machines are constructed.
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