The Ten Books on Architecture, 4.6.5

Vitruvius  translated by Joseph Gwilt

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5The arrangement of the rails is to be such, that when the height is divided into five parts, two are given to the upper and three to the lower rail. In the centre the middle rails (medii impages) are placed; the others are disposed above and below. The width of the rail is to be one-third of the pannel, and its cymatium a sixth part of the rail itself. The width of the inner styles is one half of the rail, and the raising (replum) four sixths of the rail. The styles nearest the dressings are made one half of the rail. If the doors are folding, the height remains the same, but the width is to be increased. If in four folds, the height is to be increased.

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