‹‹‹ Vitr. 4.6.2 | Table of Contents | Vitr. 4.6.4 ›››
3If the doors are Ionic, their height is to be regulated as in those that are Doric. Their width is found by dividing the height into two parts and a half, and taking one and a half for the width below. The diminution is to be as in the Doric door-way. The width of the dressings is to be a fourteenth part of the height of the aperture; the cymatium a sixth part of their width; the remainder, deducting the cymatium, is to be divided into twelve parts, three of which are given to the first fascia, with the astragal, four to the second, and five to the third. The fasciæ, with the astragal, run quite round the dressings.
3If the doorways are to be of the Ionic style, the height of the aperture should be reached in the same manner as in the Doric. Let its width be determined by dividing the height into two and one half parts and letting one of them form the width at the bottom. The diminutions should be the same as for Doric. The width of the faces of the jambs should be one fourteenth of the height of the aperture, and the cymatium one sixth of the width. Let the rest, excluding the cymatium, be divided into twelve parts. Let three of these compose the first fascia with its astragal, four the second, and five the third, the fasciae with their astragals running side by side all round.