In Fig. 357 is shown the plan and a portion of the side view of a bay window. In the side view is also shown the section of a lintel molding, shown indefinitely by C D E F of the plan, which it is required to miter against the oblique side of the large cove under the bay window indicated by B C F of the plan. In Fig. 358 is shown an enlarged plan of the particular portion in which the miter occurs, the angle
BCD being the same as B C D of Fig. 357. In Fig. 358, A B F G represents the base of the window and G E D C the lintel cornice. The profiles are shown respectively at Y and X. The lintel molding is continued in the direction of F G until it intersects the base of the window between G and C.
In order to obtain the pattern of that part of the lintel molding which abuts against the base of the window indicated from G to C, it is first necessary to obtain the plan of the intersection or shape of the miter line, as shown in plan by G H C F. To obtain this miter line proceed as follows: Opposite to and in line with the profile Y draw a duplicate of X, as shown at Z. In placing the profile Z in position it must be I remembered that as hights are all to be compared the vertical lines of each profile must be placed parallel and their upper ends turned in the same direction. Therefore, the back or line 1 to 13 of the profile Z is placed parallel to B C, which represents a vertical line with reference to the profile V. and the point 12 is placed exactly opposite the point J, according to the requirements of the side view, Fig. 357. Divide the profiles X and Z into the same number of parts, as indicated by the small figures in each. From the points thus obtained in profile Z carry lines at right angles to H C, cutting K J of profile Y. as shown. With the T-square placed parallel with the line B C of the plan of the window earn lines from the points on the profile K.I in the direction of G and F; also draw lines from the points in the profile X parallel to G E, cutting the lines of corresponding number drawn from the profile Y. A line traced through points of intersection, as shown by G H C F, will give the miter line, as shown in the plan.
Fig. 357. - Plan and Sectional View of a Level Molding Mitering Obliquely Against Another Lever Molding of Different Profile.
Fig. 358. - Method of Obtaining the Pattern of the Lintel Molding Shown in Fig. 357.
While the curved portions of the profiles X and Z have, been divided into such a number of spaces as will answer the purpose of an ordinary miter, it will be noticed that the plane surfaces between points 2 and 3 and 11 and 12 intercept so much of the curve of K
J as to produce a curve between those points in the pattern. Therefore, for accuracy it is necessary to subdivide those spaces on K J, as indicated by a b and C d e there shown. These points must be dropped back to the profile Z, and the spaces thus produced transferred to the stretchout line L M, all as indicated. The lines indicated by the small letters in K J have only been drawn part way in the engraving to avoid confusion, and the measuring lines produced by these points in the stretchout have been shown dotted for the sake of distinction. These points are then intersected with the surfaces to which they belong in the miter line G H <'. as shown between 2 and 3 and 11 and 12.
For the pattern of the lintel molding first draw a line at right angles to it, as shown by L M, on which line lay off a stretchout of the profile X, as indicated by the small figures. Through the points thus obtained draw the usual measuring lines. With the T-square placed parallel with the stretchout line L M carry lines from the points in G H C F to measuring lines of corresponding number, when a line drawn through the points of intersection, as shown by N O P, will complete the pattern.