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4Having thus determined the size of the hole, which in Greek is called περίτρητος, a sight hole (scutula) is described two holes and a quarter in length, and two holes and one sixth wide. Let the line described be bisected, and when so bisected, let the figure be obliquely turned till its length be equal to one sixth part, and its width on which it turns that of the fourth part of a hole. In the part where the curvature is, at which the points of the angles project, and the holes are turned, the contractions of the breadth return inwardly, a sixth part. The hole must be as much longer as the epizygis is thick. When it has been described, the extremity is to be so divided that it may have a gentle curvature.
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