The Ten Books on Architecture, 10.13.6

Vitruvius  translated by Joseph Gwilt

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6The construction of the tortoise ram is similar: it was thirty cubits wide, and, exclusive of the roof, sixteen high. The height of the roof from the eaves to the ridge, seven cubits. On the top thereof in the centre rose a small tower, not less than twelve cubits wide: it was raised with four stories, on the upper of which the scorpions and catapultæ were placed, and in those below was kept a large store of water, to extinguish the flames in case it should be fired. In it was placed the machine for the ram, which the Greeks call κριοδόκη, wherein was the round smooth roller on which the ram worked backwards and forwards by means of ropes, and produced great effect. This, like the tower, was covered with raw hides.

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