The problem presented in Figs. 396 and 397 is one occasionally arising in pinnacle work. The figures represent the side and end elevations of a pinnacle which is rectangular, but not square. All of its faces are finished with gables whose moldings miter with each other at the corners, and which are of the same hight in the line of their ridges, as indicated by L M and L1 M1. Whatever profile is given to the molding in one face of such a structure, the profile of the gable in the adjacent face will require some modification in order to form a miter. In Fig. 396 let A be the normal profile of the molding placed in the gable of the side elevation. Before the miter patterns can be developed it will first be necessary to obtain the miter line or joint between the moldings of the adjacent gables as it will appear in the elevation, to accomplish which proceed as follows: Draw a duplicate of A, placing it in a vertical position directly below or above the point at which the two moldings are to meet, as shown by A1. Divide both of these profiles into the same number of parts, as indicated by the small figures, and through these points draw lines intersecting in the points from H to K, as shown. Then a line traced through these intersections will be the miter line in elevation. For the pattern of the molding of the side gable lay off at right angles to H M a stretchout of the profile A, as shown by B C, through the points of which draw the usual measuring lines. Place the T-square at right angles to the lines of the molding, or, what is the same, parallel to the stretchout line, and, bringing it against the several points in the miter line H K, cut corresponding measuring lines. Then a line traced through these points, as shown by D E, will be the shape of the cut at the foot of the side gable to miter against the adjacent gable.

Fig. 396.   Side Elevation of Rectangular Pinnacle, Showing the Miter Between the Moldings of Adjacent Gables.

Fig. 396. - Side Elevation of Rectangular Pinnacle, Showing the Miter Between the Moldings of Adjacent Gables.

The next step is to obtain the correct profile of the molding on the adjacent gable. H K having been established as the correct elevation of the miter, its outline may now be transferred, with its points, to the end elevation of the pinnacle, as shown at H1K1, Pig. 397, reversing it, because it appears here at the right side of the gable, whereas it appeared at the left of the other. Draw a duplicate of the normal profile, as shown at A3, placing its vertical lines at righ1 angles to the lines of the gable, and divide it into the same spaces as in the first operation. From these points draw lines at right angles across the molding, which intersect with lines drawn parallel to the molding from the points in the miter line H1 K1. Then a line traced through these points of intersection will form the required modified profile, as shown by W X.

For the pattern of the molding of the end gable proceed as follows: At right angles to the lines of the raking cornice lay off a stretchout of the profile W X, as shown by P R, through the points in which draw measuring lines in the usual manner. With the T-square at right angles to the lines of the raking cornice, bringing it successively against the points in K1 H1, cut corresponding measuring lines. Then a line traced through these points of intersection, as shown from S to T, will be the pattern required.

Fig. 397.   End Elevation of Rectangular Pinnacle, showing Same Miter as in Fig. 396.

Fig. 397. - End Elevation of Rectangular Pinnacle, showing Same Miter as in Fig. 396.