'1'o obtain the pattern for the upper and lower return mouldings, proceed in precisely the same manner as explained in connection with returns 13 a:!(1 I) in Fig. 303.
The method of proceeding with work of this kind is explained in detail in Fig 307, where the principles are thoroughly explained. Let AB C D E represent a plan view of the wall, over which a gable moulding is to be placed, as shown by G H I J, the given profile of the moulding being shown by L M. Divide the profile into equal spaces as shown by the figures 1 to 4. Parallel to I H or J G, and through the figures mentioned, draw lines indefinitely as shown. Bisect the angle B C D in plan, and obtain the miter-line as follows: With C as center, and any radius, describe the arc N 0. With N and 0 as centers, and any radius greater than C N or C 0, describe arcs intersecting each other at P. From the point C, and through the intersection P, draw the miter-line C Q. Transfer the profile L M in elevation to the posi tion shown by R S in plan, dividing it into the same number of spaces as L M. Through the figures in the profile'R S, and parallel to D C, draw lines intersecting the miter-line C Q, as shown. From the inter sections on the miter-line, and parallel to C B, draw lines intersecting the surface B A. Now, at right angles to C D in plan, and from the intersections on the miter-line C Q, draw vertical lines upward, inter secting lines of similar numbers drawn from points in profile L M in elevation parallel to J G. A line traced through points thus obtained, as shown from 1' to 8', will be the miter-line in elevation.
For the pattern for that part of the moulding shown by C D E Q' in plan, and 11 G 8' 1' in elevation, proceed as follows: At right angles to 1 H in elevation, draw the line T U, upon which place the stretchout of the profile L M, as shown by the figures 1 to 8. At right angles to TL', and through these figures, draw lines, as shown, which intersect with lines of similar numbers drawn at right angles to 1 H from intersections on the miter-line 1' 8' and from intersections against the vertical surface H G. Lines traced through points thus obtained, as shown by V VV X Y, will be the pattern for that part of the gable shown in plan by C D E Q' of Fig. 307.
In Fig. 308, on the other hand, the position of the plan is changed, so as to bring the line A Q horizontal. At right angles to B C draw the vertical line C E, on which locate any point, as E. In the same manner, at right angles to C B, draw the vertical line B J indefinitely. From the point E, parallel to B C, draw the line E 8", intersecting the line J B, as shown. Now take the distance from 8" to J in eleva tion, Fig. 307, and set it off from 8" toward J in Fig. 308. Draw a line from J to E, which will represent the true rake for this portion of the moulding. Now take the various heights shown from 1 to 8 on the line Z Z in elevation in Fig. 307, and place them as shown by Z Z in elevation, Fig 308, being careful to place the point 8 of the line Z Z on the line 8" E extended. At right angles to Z Z, and from points on same, draw lines, which intersect with lines drawn at right angles to B C from intersec tions of similar numbers on C Q in plan. A line traced through points thus obtained, as shown by D E in tion, will be the miter-line on C Q in plan.
From the intersections on the miter-line D E, and parallel to E J, draw lines, which intersect with lines drawn from intersections of similar numbers on A B in plan at right angles to B C. A line traced through points thus obtained, as shown by F J, will be the miter-line or line of joint against the pier shown in plan by B A.