Figure 4.27 Example on how to draw an arc tangent to two
radii or diameter
T. To Draw an Ellipse (By Four-Centered Method)
Join 1 and 3, layoff 3-5 equal to 01-03. This is done
graphically as indicated in the fig. Below by swinging 1 around
to 5 with O as center where now 03 from 05 is 3-5; the
required distance. With 3 as center, an arc from 5 to the
diagonal 1-3 locates 6. Bisect 1-6 by a perpendicular crossing
0-1 at 9 and intersecting 0-4 produced (if necessary) at 10.