SECT. Plate X. Of Mouldings, with their Returns at the Angles of Planes or Walls, which are difpofed parallel, and perpendicular to the Piâure. Example, Plate X. Fig. 1. The planes A and E are parallel, while thofe marked B and F are perpendicular to the picture. They reprefent four walls, at right angles with each other, furmounted by a cornice, having the returns of the mouldings agreeably to the plan, Fig. 4. which is half the fize of Fig. 1. The line D C is the horizontal line, C is the center of the picture, and D is the distance. First determine the perspective appearance of the form of the building, by the rules already given in the preceding part of this Section; and having found the different angles marked by the letters f, g, L, m, and R, proceed as follows: The plane or wall which is nearest to the fpectator is A, confequently the nearest angle is g, k, S; therefore, upon that angle, draw the geometrical profile of the mouldings or cornice a, b, c, d; and let the points g, i, k, be confidered as the mitre points of the mouldings upon the angle of the walls A and B, for thofe points are the feats of the lines which form the different members upon that angle. Through the points g, i, k, draw right lines to the center of the picture C, which lines will interfect the line Y L, the inner angle of the planes B and E, in the points L, o, p, which will be the points for the mitres of the mouldings, at the interior angle L Y of the planes or walls B, E; for the lines which are drawn from the nearest angle g, k, of the building, to C, transfer the geometrical heights of the mouldings from the line g, i, S, to the line L Y. Then II. Plate X. Then through the points g, i, k, on the neareft exterior angle, SECT. and also through the points L, o, p, in the nearest interior angle, draw lines from the point of distance D, as D g 1, in the exterior angle, and D L 4 in the interior angle; repeating the fame procefs through the points i, k, o, P; and thofe lines will be the mitre lines for the different members of the cornice, upon the planes A and B. Then determine the perspective appearance of the mouldings, by drawing lines from the center of the picture C, through the points a, b, c, of the geometrical profile, till they cut the mitre lines of both angles, as the lines C a 1, Cb 2, and C c 3, which lines form the reprefentations of the Cima Recta and Corona of the cornice, upon the plane or wall B. The front Z of the cornice must then be obtained by the following method : The vertical line V f is the outer angle of the plane A, and the points f, h, x, V, are the mitre points for the mouldings upon the angle V f. Thofe points are found by continuing the lines of the geometrical profile of the cornice to that angle, as marked in the example; therefore, through the points f, x, h, draw lines from the contrary point of distance to that which was before employed, as the lines f, K 2, and h, t, and alfo through the points x and V, which lines will determine the projection of the members of the cornice upon the angle V. Then from the points 1, 2, 3, and the other points of the perfpective profile, draw lines parallel to the horizontal line, as the lines 1 K 2, 2 t, 3 O, and alfo from the lower points. Then find the reprefentations of the mouldings upon the plane or wall E, as follows: From the points L, o, p, which are the feats of the mouldings upon the line Y L, draw lines parallel to the horizontal line, which lines muft SECT. muft interfect the line M m, as the lines L m, u o, and p q; and the II. Plate X. Pq; points of intersection m, n, q, will be the feats of the mouldings on the exterior angle M m of the plane or wall E. Through the points m, n, q, draw right lines from the distance of the picture D, as the lines m s, n 9, and fo on of the rest; and those lines will be the mitre lines for the mouldings upon the outer angle M of the plane or wall E. Then from the points 4, 5, and 6, which points are the extreme projections of the perfpective profile of the mouldings in the inner angle, draw lines parallel to the horizontal line; and the intersection of those lines with the mitre lines, as m 8, and the other lines, will determine the perfpective projection of the mouldings upon the angle M. To complete the farther angle QR, find the feats of the mitre points upon the line QR; which is done by drawing lines from the points m, n, and q, to the center of the picture C, which lines will interfect the line Q R in the points RT, and y; through which points draw lines from the contrary point of distance to that which was before employed, and thofe lines will be the mitre lines for the termination of the remote angle Q R. Then from the points 8 9, and alfo from the other points in the perspective profile of the mouldings on the angle M m, draw lines to the center of the picture C, which lines will exprefs the upper and lower fillets of the Cima Recta, and their interfections with the mitre lines at W and Z, will mark the projection of the mouldings upon the outer angle, the curved profiles of which must be drawn by hand, as muft all the profiles of the other angles. * Observe, that this point of distance is not in the plate, for want of room. The |