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8Thus also oxen have an equal draft when the piece which suspends the pole hangs exactly from the middle of the yoke. But when oxen are not equally strong, the method of apportioning to each his due labour is by shifting the suspending piece so that one side of the yoke shall be longer than the other, and thus relieve the weaker animal. It is the same in the porters’ levers as in yokes, when the suspending tackle is not in the centre, and one arm of the lever is longer than the other, namely that towards which the tackle has shifted; for in this case if the lever turn upon the points to which the tackle has slid, which now becomes its centre, the longer arm will describe a portion of a larger circle, and the shorter a smaller circle.
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