Page:Sheet Metal Drafting.djvu/61

Rh Figs. 66 and 72. It should be noticed in drawing Fig. 68, that points 2 and 12, 3 and 11, 4 and 10, 5 and 9, and 6 and 8 fall on

the same extension lines. In view of this fact, many draftsmen save time by drawing a half-profile as shown in the elevation of Fig. 73.