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132
SHEET METAL DRAFTING
point 1 of the plan, the extension line is traced to the miter line, and thence to a correspondingly numbered line in the stretchout. In like manner, all points of intersection can be located in the stretchout. A curved line passing through these points will give the miter cut. The pattern is completed by an extension line drawn from the
Figs. 182-185—Roof Flange to Fit Over Ridge and Hips of Roof.
top of the pipe. A lock is added to each side of the pattern. A flange (not shown) should be added to the miter cut.
The Apron.—The exact spacing of points 10, 11, 12, 1, 2, and 2½, as shown on the center line of Fig. 183 by lines a, b, c, d, and e, are set off upon any straight line, Fig. 185. These points also
