Let N X V E in Fig. 351 be the elevation of a gable molding of which A BCD is the profile, and K O M L be the elevation of a molded pilaster against which it is required to miter. The profile of the pilaster is shown by J I H in the plan, where a profile of the gable mold A1 B1 C1 D1 is also shown and so placed as to show the comparative projection of the various points in each. By an inspection of the plan and elevation it will be seen that the miter line or joint between the molding and the pilaster will not be straight from N to E, as would be the case if the side of the pilaster were perfectly flat and projected further than the gable molding. It will therefore be necessary to first obtain a correct elevation of the miter, after which the pattern can be obtained in the usual simple manner.
Fig. 151. - The Pattern for a Gable Molding Mitering Against a Molded Pilaster.
To do this divide the profiles in the plan and elevation into the same number of equal parts, commencing at the same points in each, as shown by the corresponding figures, From the divisions in the profile in plan carry lines to the left, parallel to H A1, until they cut the side of the pilaster H I J, as shown. From these intersections drop lines at right angles to H A1 indefinitely, as shown. From the divisions in the profile in elevation draw lines parallel to N X until they intersect corresponding lines drawn from H I in plan. A line traced through these intersections, as shown by N F E, will be the required miter line, or intersection of the gable molding with the upright pilaster at the angle O N X.
For the pattern of the gable molding proceed as follows: At right angles to the lines of the gable molding draw the stretchout line A2 D2, upon which place the stretchout of the profile of the gable molding, through which draw the usual measuring lines, which intersect with lines of corresponding number drawn from the points in the miter line N F E at right angles to the lines of the gable molding. A line traced through these intersections, as shown by N G E2. will be the required pattern.
Although the roof strip A B of the gable molding is perfectly straight, points will have to be introduced between A and B for the purpose of ascertaining the shape of the cut from N to F, its intersection with the side of pilaster. The simplest method of obtaining these points is to derive them from the points between B1 and C1. as shown by 0' to 5' in the plan. They can then be transferred to their proper place in the stretchout, as shown, between A2 and B2. By so doing points of like number fall in the same place on the profile H I, and the vertical lines dropped therefrom can be intersected with F X for the pattern of the roof strip and with the other lines from F to E for the pattern of the face of the mold, all of which is clearly shown.