The Ten Books on Architecture, 10.16.4

Vitruvius  translated by Joseph Gwilt

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4Immediately after this, king Demetrius, who, from his resolution, was sirnamed Poliorcetes, prepared to wage war against the Rhodians, and brought in his train Epimachus, a celebrated architect of Athens. This person prepared an helepolis of prodigious expense and of ingenious and laborious construction, whose height was one hundred and twenty-five feet, and its width sixty feet: he secured it, moreover, with hair-cloths and raw hides, so that it might securely withstand the shock of a stone of three hundred and sixty pounds weight, thrown from a balista. The whole machine weighed three hundred and sixty thousand pounds. Callias being now requested by the Rhodians to prepare his machine against the helepolis, and to swing it within the wall, as he had promised, confessed he was unable.

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