This section is from the book "The New Metal Worker Pattern Book", by George Watson Kittredge. Also available from Amazon: The new metal worker pattern book.

Let A B L K in Fig. 272 be the elevation of a portion of a cornice, of which C D is the profile and A B the angle or inclination of the surface against which the cornice is required to miter. Divide the curved parts of the profile into spaces in the usual manner, and from all points in profile draw lines parallel with A K, cutting the miter line A B. On any convenient line, as E F, at right angles to the cornice, lay off a stretchout of the profile C D, space by space as they occur, through the points in which draw the measuring lines, all as indicated by the small figures. Placing the T-square at right angles to the lines of the cornice, or, what is the same, parallel to the stretchout line, bring it successively against the points in the miter line A B and cut measuring lines of corresponding number, as indicated by the dotted lines. A line traced through these points, as indicated by H G, will be the pattern required.

Fig. 272. - A Butt Miter Against a Plain Surface Oblique in Elevation.

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