The Ten Books on Architecture, 10.10.3

Vitruvius  translated by Joseph Gwilt

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3The space wherein the arrow is placed in the middle of the post, the fourth part of a hole. The four angle pieces which appear on the sides and front, are strengthened with iron hoops fastened with copper or iron nails. The length of the channel which is called στρὶξ in Greek, is nineteen holes. That of the slips (regulæ) which lie on the right and left of the channel, and which some persons call buckle, is also nineteen holes, their height and width half a hole. Two other slips are fixed for attaching the windlass, three holes long and half a hole wide. The thickness of a slip is called camillum, or according to others the dove-tailed box, and is of the dimension of one hole, its height half a hole. The length of the windlass is eight holes and an eighth. The roller nine holes wide.

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