Upon the Architrave in the Friese ought to be the Triglyphs and the Metops. The Triglyphs have a Module and a half for their height, and a Module for their breadth; the Metops are as high as broad; One Triglyph must be placed directly upon every Pillar, and the Intercolumniation ought to have three; towards the Corners must be placed the Demi-Metops.
The breadth of the Triglyph being divided into six parts, five of them must be left in the middle, and the two halfs which remain on the right and the left, must be for Demi-Graveurs; The part in the middle, and the two last of the five, must be for the three Feet, and the two which are betwixt the three Feet, must be for the Graveurs or Channels, which must be hollowed, following the Corner of the Mason’s Rule. The Capital of the Triglyph ought to have the 6th. part of a Module.
Upon the Capital of the Triglyph is placed the great Cornice, its Jetting or Projecture, is half a Module and the 6th. part of a Module, its height is half a Module, comprising the Dorick Cymatium, which is under it.
On the Plat Fonds of the Cornice, must be hollowed little strait ways, which must answer perpendicularly to the sides of the Triglyphs, and the middle of the Metops.
Streight upon the Triglyphs must be cut 9 Goutes or Drops, which must be so distributed, that there may be six length-wise, and three broad-wise; in the Spaces which are betwixt the Metops, because they are greater than those between the Triglyphs: nothing must be cut unless it be Foudres. Moreover towards the border of the Crown must be Carved a Scotia.
Some advance perpendicularly above the Triglyphs, the Ends of the Forces or Principals to frame the Mutils which support the Cornices; so that as the Disposition of Beams hath caused the Invention of Triglyphs, so the jetting of the Forces hath caused the Disposition of the Mutils, which support the Cornices. See [Tab. VI.]
ART. VII.
Of the Ionick Order.