As a feature of design, it frequently occurs that a belt course between stories is carried around pilasters which occur between all the windows of a front, and which rise from the foundations to the main cornice. In a certain instance, small gables or pediments were introduced between the pilasters in such a manner that the miters at the foot of the gables came partly upon the roof or wash of that part of the belt course lying between the pilasters and partly upon the wash of the returns at the sides of pilasters. Such a condition of affairs presents some interesting features and is shown in Fig. 356, of which A B C is the front elevation. D E G shows the plan of the belt course, upon which the foot of the gable mold is required to miter in the vicinity of F.. The gable mold, of which J C is the elevation and H the profile, is required to meet the level cornice at the angle C J M, its top line starting from the point J. In this instance, as in many others, the first requisite is that of obtaining a correct elevation of the miter between the gable mold and the three washes. To facilitate this operation it will be necessary to draw a side view which will show the comparative projection of the gable mold, the pilaster and the belt cornice from the face of the wall, as shown at the right. Divide both profiles of the gable mold into the same number of spaces, as shown by the small figures. From the points in the profile H of the elevation carry lines parallel to C J, extending them across the line J L indefinitely. From the points in H1 drop lines cutting the profile of the wash of the belt course O P so far as they fall within its projection. From the points in O P carry lines horizontally across the elevation till they intersect lines of corresponding number previously drawn from the profile H. Inspection will show that only the lower portion of the profile will miter upon the main wash and that, therefore, the above operation can be begun with advantage at point 14 and continued until a line traced through the points of intersection crosses the line J K, which is really the profile of the wash of the return. This, as will be seen, occurs at S, which point can be carried back to profile H (shown at a), where it will be subsequently needed in obtaining the stretchout of the gable mold. Above the point x of the profile all points will fall against the wash of the return J K until the projection of the mold carries them across the forward miter of the return (J1 K1 in plan), after which they will fall upon the wash in front of the pilaster. This point of crossing can be found by reversing the operation above described, thus: From points upon J K above S cary lines horizontally across to side view, intersecting them with lines of corresponding number dropped from profile H1 until a line traced through points of intersection, shown by S1 T1, crosses the line O1 P1, as shown at point T1, which point happens to coincide with point 4 of profile. From point 4 of profile H1 lines are dropped upon O1 P1, from which they are carried horizontally across as in the first part of the operation till they intersect with lines of corresponding number drawn from points in profile H, as shown from T to N. Then the line J N TSL will be a correct elevation of the required intersection and can be used as the miter line from which to obtain the final pattern of the gable mold. With this as a miter line and H as a profile the remaining operation is performed in the usual manner. Upon any line, as V W, drawn at right angles to J C lay off a stretchout of the profile of gable mold. In obtaining this stretchout the position of point x must be obtained from profile H, while from profile H1 is obtained the position of point Q, which shows the point at which the roof piece of the gable mold passes beyond the side of the pilaster, shown best at J1 in the plan. With the T-square placed parallel to V W, and brought successively against the points in J N T S L, cut measuring lines of corresponding number. A line traced through the points of intersection, as shown by J1 N1 S1 L1, will give the required pattern. The plan view of the intersection is shown at N2 L2, with some of the lines of projection used in obtaining it, merely to assist the student in seeing the relation of parts, but is not necessary in the actual work of obtaining the pattern.
Fig. 356. - The Pattern for an Inclined Mottling Mitering Upon a Wash Including a Return.