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7the length of shaft of the small ladder (climacis) thirteen holes, its thickness three sixteenths: the breadth of the middle interval is a quarter of a hole, its thickness five thirty-seconds of a hole: the length of the upper part of the climacis near the arms, where it is joined to the table, is to be divided into five parts; of these, two are given to that part which the Greeks call χηλὸς (the chest), the width one sixteenth, the thickness one quarter, the length three holes and an eighth, the projecting part of the chest half a hole. The pteregoma (or wing), one twelfth of a hole and one sicilicus. The large axis, which is called the cross front, is three holes;
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