The same is also the case with regard to the two sides of a bow window, where the sides are vertical planes at any angles with each other.
Fig. 1. Plate CCCXXXV. Shews the elevation of a tri angular pediment with a modillion cornice.
Fig. 2. Shews the elevation of an open pediment with the same cornice as Fig. I. It is in such examples as these that raking mouldings occur.
Fig. 3. Shews the method of traning a raking cimarecta. The curve turned towards Fig. 2. is the return moulding in the open part of the pediment, Fig. 2. The curve next to the margin of the plate is the return moulding at the lower extremities of the pediments, Fig. 1. and 2. The middle curve is a section of the raking or inclined mould ing itself.
Fig. 4. Shews the front of a modillion, with the raking moulding which forms the cap. The upper extreme curve is a section of the level return at the top ; the lower ex treme curve is a section of the level return moulding at the bottom ; and the curve shewn in the middle is a section of the raking moulding itself. This is the same modillion as shewn in the designs of Figs. 1. and 2.
Fig. 5. Shews the section of a raking cavetto, and that of the return moulding at the bottom.
Fig. 6. Shews the section of a raking ovolo, and the sec tions of the return mouldings at the top and bottom. As the principle of all these is the same, though the forms are different, we shall here describe the method of tracing these curves. Admitting the curve ABCDEF at the bot tom to be given : draw lines B b C c c, D d d, E c e, F ff, parallel to A a a, or to the fillets of the Draw Al, BK, CL, DM, EN, FO perpendicular to FG, and draw any straight line IKLMNO parallel to FG, place the distances 1K, KL, LM, MN, NO, upon any part of the fillet, and draw the straight lines i a, k b, I c, m d, n e, o f, and a b c d e f is the section of the raking moulding. In the same manner, by drawing any straight line i k l in n o parallel to FG, and drawing i a, k 6,1 c, d, n e, o f; per pendicular to FG, we shall obtain the curve b c d el; and the lower side of the fillet a b for the section of the return moulding at the top, if any should be wanted.
Fig. 7. Section of a raking architrave and soffit for the re turn of a splayed window, which is sometimes both neces sary and ornamental in thick walls. No. 1. is the archi
trave for the soffit, which we shall suppose to be given in order to obtain No. 2. Let DF represent a section of the plane of the face of the soffit, then to find any point in the curve, draw E e perpendicular to DF cutting Cf, the face of the taking architrave, at f; make f e equal to FE, and e will be a point in the raking moulding of the splayed architrave. Other points will be found in the same man ner, and when a sufficient number are obtained, the curve may be drawn through these points by the hand.
Fig. 8 Is another design finished with needed mould ings ; the method of tracing is the same, but this is more particularly explained in the next figure.
Fig. 9. Is the method of tracing the moulding of a raking architrave more particularly explained. The moulding chosen for this purpose is an ogee reverse. No. 1. is the given moulding. No 2. the raking one, which is required to be found. AE, e B, are the edges of the mouldings, which are supposed to be in the plane of the finishing of the walls. EF and e f are the fillets which front each' other. FG,f g, the sides of the quirks of the mouldings. 1K, i k, the furs of the fillets. LK 1 k, the returns of the same, and 1QPHONG, and iqfthon g, ogee mouldings. Then to find any point h in the curve, draw H h parallel to AB, and supposing these mouldings to be of equal thickness, draw a e perpendicular to BC; make a e equal to AE; draw HM perpendicular to AE, cutting it at M; make a in equal to AM, and draw in h parallel to BC, h will he a point in the raking moulding as required. In the same manner, all the other points will be found and completed as before.
Fig. 10. Is a torus moulding for skirting stairs. The curve at the lower end shows the section that the moulding at the return makes in the passage below. The upper curve is a section of the moulding on the return at the land ing. The middle curve is a section of the moulding placed in the staircase itself. This form of oblique curvatures would only take place in a straight flight of stairs, where the steps both begin and end in the passages.