Page:Sheet Metal Drafting.djvu/87

Rh Pattern for the "Tee."—After the line of stretchout is drawn at right angles to the tee in Fig. 108, the spacing of the profile should be set off on it and the divisions numbered to correspond. The measuring lines of the stretchout are put in at right angles to the line of stretchout. Since the branch is at an angle of 45°, all of this construction work can be drawn with the T-square and the 45" triangle. Extension lines parallel to the line of stretchout are

carried from each intersection of the developed miter line until they cut corresponding measuring lines in the stretchout. A curved line through these intersections will give the miter cut of the pattern.

Opening in Main Pipe.—A line of stretchout, Fig. 109, is drawn at right angles to the main pipe of Fig. 107. The spacings of the apparent miter line are set off on this line and the divisions lettered to correspond. Measuring lines are drawn from each point at