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The pycnostyle is a temple in an intercolumniation of which the thickness of a column and a half can be inserted: for example, the temple of the Divine Caesar, that of Venus in Caesar's forum, and others constructed like them.
Let the thickness of the columns at the bottom be two modules; an intercolumniation, five and a half modules; the height of a column, excluding the capital, fourteen modules; the capital, one module in height and two and one sixth modules in breadth. Let the modular proportions of the rest of the work be carried out as written in the fourth book in the case of temples.
A TRIGLYPH is a block whose height is nearly twice its width; upon its face are two furrows, triangular in plan, and its outer edges are chamfered off. Thus we may say that the triglyph has two furrows and two half-furrows; these do not extend to the top of the block. A triglyph is placed over the center of each column and over the center of each intercolumniation.
On each side, there are niches in the intercolumniation of the walls, together with pedestals and shafts of pillars, cornices, and an entablature, which indicate the former magnificence of the building. It was destroyed during the civil war that raged in the reign of Henry III. of France.
There are remains of an aqueduct at Tusculum which are interesting from the fact of the horizontal being combined with the true arch in its construction. No Etruscan temples remain now, but we know from Vitruvius that they consisted of three cells with one or more rows of columns in front, the intercolumniation or interval between the columns being excessive.
The opposite, or back, wall was pierced by two doors, which faced the intercolumniations of the side rows of pillars, as the front door faced the intercolumniation of the central rows. Between the two doors which pierced the back wall was a squared recess, and similar recesses ornamented the same wall on either side of the doors.
The Greeks solved it by reducing the width of the end intercolumniation, but later critics disliked this, and solved it by removing the end triglyph from the angle and placing it axial over the end column. Meanwhile, on the other side of the Aegean, the Ionic order was reaching its perfect form through a similar process of systematic thought on a type definitely adopted.
The construction will be diastyle when we can insert the thickness of three columns in an intercolumniation, as in the case of the temple of Apollo and Diana. This arrangement involves the danger that the architraves may break on account of the great width of the intervals.
At the centre, vertically under the gable, there should be room for three triglyphs and three metopes, in order that the centre intercolumniation, by its greater width, may give ample room for people to enter the temple, and may lend an imposing effect to the view of the statues of the gods. The columns should be fluted with twenty flutes.
The systyle is a temple in which the thickness of two columns can be placed in an intercolumniation, and in which the plinths of the bases are equivalent to the distance between two plinths: for example, the temple of Equestrian Fortune near the stone theatre, and the others which are constructed on the same principles. These two kinds have practical disadvantages.
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