If for any reason it is desired to show the elevation of the miter line FI in plan (it not being necessary in the development of the pat tern), then erect vertical lines from the various intersections on FI, intersecting similar lines in elevation. To avoid a confusion in the drawing, these lines have not been shown. Trace a line through points thus obtained, as shown by 13, which is the desired miter line in elevation.
The next step is to obtain the true profile at right angles to HI and IJ in plan. To obtain the true profile through No. 3 in plan, take a tracing of J F, with the various intersections thereon, and place it on a line drawn parallel to CD in elevation, as with the intersections 1 to 13, as shown. From these intersections, at right angles to erect lines intersecting similar lines drawn through the profile DE in elevation. Trace a line through the points thus obtained, as shown by 1' to 13', which represents the true profile for part 3 in plan. At right angles to III in plan, draw any line, as ML, and extend the va rious lines drawn parallel to IH until they intersect LM at points 1 to 13, as shown.
Take a tracing of LM, with the various points of intersection, and place it on any horizontal line, as as shown by the figures 1 to 13, from which, at right angles to erect vertical lines inter secting similarly numbered horizontal lines drawn through the profile DE. Trace a line through the points thus obtained. Then will 1"-13" be the true profile through No. 2 in plan at right angles to HI.
For the pattern for No. 1 in plan, extend the line FK, as NO, upon which place the stretchout of the profile DE as shown by the figures 1 to 13 on NO. At right angles to NO, and from the figures, draw lines, which intersect with lines (partly shown) drawn parallel to FG from similar intersections on the miter-line FH. Trace a line through the points thus obtained; then will 1 P 13 be the pattern for part 1 in plan.
At right angles to H I, draw any line, as T U, upon which place the stretchout of profile No. 2, being careful to measure each space separately, as they are all unequal, as shown by the small figures 1" to 13" on TU. Through these figures, at right angles to TU, draw lines as shown, which intersect by lines (not shown in the drawing) drawn at right angles to I H from similar points on the miter-lines HF and F1.
Trace a line through the points thus obtained. Then will V W X be the pattern for part 2 in plan.
For the half-pattern for part 3 in plan, extend the center line A B in plan as B R, upon which place the stretchout of the true profile for 3, being careful to measure each space separately, shown by the figures 1' to 13' on BR. At right angles to B R draw lines through the figures, which intersect by lines drawn at right angles to J I from similar points of intersection on the miter-line F I. A line traced through points thus obtained, as 1' S 13', will be the half-pattern for part 3.