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7The shafts of the “ladder” are thirteen holes in length, one hole in thickness; the space between them is one hole and a quarter in breadth, and one and one eighth in depth. Let the entire length of the ladder on its upper surface—which is the one adjoining the arms and fastened to the table—be divided into five parts. Of these let two parts be given to the member which the Greeks call the χελὡνιον, its breadth being one and one sixth, its thickness one quarter, and its length eleven holes and one half; the claw projects half a hole and the “winging” three sixteenths of a hole. What is at the axis which is termed the . . . face . . . the crosspieces of three holes?
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