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3These turned on naves, or hamaxopodes, as they are called. Above the surface of the cross pieces which were on the base, upright posts were erected, eighteen feet and a quarter high, three quarters wide, and three-twelfths thick, and one and three quarters apart. Above them were beams all round, which tied the machine together, they were one foot and a quarter wide, and three quarters thick. Over these the braces were placed, and were twelve feet high. Above the braces was a beam which united the framing. They had also side pieces fixed transversely, on which a floor, running round them, covered the parts below.
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