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7He describes the auger (terebra) thus: the machine is made like a tortoise, as in those for the reception of the catapultæ and balistæ, and in the middle thereof is a channel on the pilasters fifty cubits long, one high, and across it an axle. In front, on the right and left, are two pulleys, by means of which is moved a beam with an iron point at its end, which works in the channel. Under the channel are rollers, which give it an easier and stronger motion. Above the beam an arch is turned to cover the channel, and receive the raw hides with which the machine is covered.
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