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.

In Fig. 288, let A B C D be the elevation of an irregular four-sided figure, to which a molding is to be fitted of the profile shown by K. Place a duplicate profile against the side opposite, as shown, from which project the lines necessary to complete the elevation of the molding as it would appear when finished, all as shown by E F G H. Draw the several miter lines B F CG, DH and A E. Divide the two profiles into the same number of parts in the usual manner, through the points in which draw lines parallel to the lines of the molding in which they occur, cutting the miter lines, as shown. At right angles to each of the several sides lav off a stretchout from the profile, as shown by L M, L1 M1 L2 M2, L3 M3. Through the several points in these several stretchouts draw measuring lines in the usual manner, producing them until they are equal in length to the respective sides, the pattern of which is to be cut. Placing the T-square at right angles to the lines of the several sides, or, what is the same, parallel to the stretchout lines, bring it against the points in the miter lines, cutting the corresponding measuring lines, all as indicated by the dotted lines. Then the lines traced through these points of intersection will give the several patterns required. Thus E1 H1 D1 A1 will be the pattern of the side E H D A of the elevation; H2 D2 C1 G1 will be the pattern of the side H D C G; G2 F1 B1 C that of F B C G; and F2 B2 A1 E2 that of the remaining side.

Fig. 288. - The Patterns of a Molding Mitering Around an Irregular Four-Sided Figure,.

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