lower. At the line of separation the middle impages are
placed: others are framed into the doors at the bottom of
the lower and at the top of the upper compartment. The
height' of the impages is a third part of the tympanum.
The horizontal scapi are together half the height of the
impages: the replum is two thirds of the remaining space;
and the cymatium above and below occupy the other third.
Those portions of the scapi which appear before the
antepagments are equal in width to half the impage. If
the doors are made folding’, it will not be necessary to
add to their height, but only to make their width somewhat
greater; but if each folding door has two valves, the height
of the doorway must be increased.
The Attic or Corinthian doorways are similar to the
Doric, excepting that the antepagments have a fascia below
the cymatium: the proportion which this fascia bears to the
antepagment, exclusive of the cymatium, is two parts to
seven. The antepagments are not to be embossed with
encaustic work, neither are they to be constructed for
the reception of double doors, but for folding doors
1 Through ignorance of the method in which ancient doors were formed, the
editors of Vitruvius alter altitudo, which is the reading of the manuscripts, to
latitudo.
» Fores valvatae are folding doors. Vitruvius, having already described the
proportions for single doors, proceds to say that if the doors be made valvatae, or
folding, it will be necessary that the doorway should be of greater width: the reason
for which is sufficiently obvious. The bifores are double doors; that is, one door
within the other, having an interval between them equal to the thickness of the wal
or of the antepagments.