Fig. 355. - The Pattern for the Molding on the Side of a Dormer Mitering Against the Octagonal Side of a Tower Roof.
Let FJHG in Fig. 355 represent a half elevation of a portion of the tower roof corresponding to A B C D E of the plan; also let U O P R S be the side elevation of a dormer cornice for which the pattern is required, K L M N being half the front elevation of the dormer, and profile of the molding. The first step before the pattern can be described is to obtain a correct elevation of the miter line or intersection of the cornice with the oblique side of the tower, as shown by UTS. To obtain this miter line proceed as follows: On A E of the plan extended as a center line, as N1 K1, draw a duplicate of the half front elevation corresponding to the half E D of the plan as shown by K1 L1 M1 N1. Now divide the two profiles of the return molding into the same number of parts, commencing at the same points in each, as shown by the small figures.
From each of the points in the upper front elevation carry lines parallel with U K cutting the side F J of the tower, and for convenience in obtaining the miter line extending them into the figure, as shown. From the intersections obtained on the side of the tower, as shown by the small figures in U S, drop lines parallel to the center line F G until they cut the miter line A D of the plan.
From the points in A D draw lines parallel with C D (the oblique side), extending them indefinitely toward A C. Now from the points in the lower front elevation K1 L1 M1 draw lines parallel with A K1, producing them until they meet or intersect lines of corresponding numbers, just described. A line traced through these intersections, as shown by U1 U2 T1 S1, will give the shape of the miter line as it will appear in plan, U2 T1 Sl showing that portion of the intersection which occurs upon the oblique side of the tower roof.
From the points of intersection in the miter line U2 T1 S1 of the plan erect lines parallel to A B, producing them until they intersect lines of corresponding numbers drawn from the profile K L M N through the side elevation.
A line traced through these intersections, as shown in U T S of the elevation, will be the miter line in elevation, formed by the junction of the return with the oblique side of the tower ADC of the plan.
To obtain the pattern proceed as follows: At right angles to U O of the elevation draw the line V W, as shown, upon which lay off the stretchout of K L M of the front elevation, as shown by the small figures, through which draw the usual measuring lines, which intersect with lines of corresponding numbers drawn at right angles to U O of the elevation from the points of intersections in the miter line U T S and from the points of intersections in the profile OPE. A line traced through these intersections, as shown by U2 T2 S2 R2 P2 O2, will be the required pattern.