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The height of the tympanum, which is in the pediment, is to be obtained thus: let the front of the corona, from the two ends of its cymatium, be measured off into nine parts, and let one of these parts be set up in the middle at the peak of the tympanum, taking care that it is perpendicular to the entablature and the neckings of the columns.
Resembling the foregoing, but more elaborate, is the mantel in the parlor with its richer moldings and intricate carving. An astragal with the customary bead and reel separates the cymatium and the corona, while a drilled rope supplies the bed molding above the dentil course.
Beneath a conventional cymatium and corona, with projections above the pilasters and central panel of the frieze, is a nicely worked dentil course, a band of vertical flutes with a drilled tooth in the upper half of each alternate flute.
Let the height of the capital be divided into three parts, of which one will form the abacus with its cymatium, the second the echinus with its annulets, and the third the necking. The diminution of the column should be the same as described for Ionic columns in the third book. The height of the architrave, including taenia and guttae, is one module, and of the taenia, one seventh of a module.
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.
The corona with its cymatium, but not including the sima, has the height of the middle fascia of the architrave, and the total projection of the corona and dentils should be equal to the height from the frieze to the cymatium at the top of the corona. A: Showing the orders reduced to equal lower diameters.
The capitals of each triglyph are to measure one sixth of a module. Over the capitals of the triglyphs the corona is to be placed, with a projection of two thirds of a module, and having a Doric cymatium at the bottom and another at the top. So the corona with its cymatia is half a module in height.
The cornice only is carried around the room at the ceiling, and in the staircase hall only the cymatium and corona of the cornice; but over the archway, supported by a colonnade of four fluted round columns, a complete entablature with nicely worked classic detail is employed and given added emphasis by several inches' projection into the reception hall.
The mantel itself took the form of a complete entablature above the fireplace opening, supported by pilasters at each side, the pilasters usually being carried up through the entablature by projections in architrave, frieze and cornice respectively, and the cymatium of the cornice forming the mantel shelf.
Let the height of a rail be one third of the breadth of a panel, and its cymatium one sixth of the rail. The width of the meeting-stiles should be one half the rail, and the cover-joint two thirds of the rail. The stiles toward the side of the jambs should be one half the rail.
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