Page:Sheet Metal Drafting.djvu/177

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FRUSTUMS OF CONES
163

c, d, e, and f of Fig. 231 over into the stretchout. Points of intersection can be determined by starting from the half-profile, tracing the extension line to the miter line, and thence to a correspond-

Figs. 230-235—Cup Strainer.

ingly numbered line in the stretchout. A curved line drawn through these intersections will give the miter cut of the pattern. A ¼-inch lap should be added to one side of the pattern.