Triangulation applied to sheet metal pattern cutting : a comprehensive treatise for cutters, draftsmen, foremen and students ... (1920)
Kidder, F. S. (Fred SMith), b. 1863 · New York : The Sheet Metal Publication Company · leaf 57
48 TRIANGULATION of the large and small circle in plan, Fig. 31. With the compasses set to a distance equal to the length of line 1 2, Fig. 32, place one point at point 1 of the pattern, (i.e., that end of line 1 1 which may be selected as the bottom of the pattern) and describe the small arc as at… … Fig. 34. Drawing showing how the Pattern may be Secured with the Least Number of Lines. of line 2 2 secured from Fig. 32 as radius, describe the small arc as shown at 2 at the bottom of the pattern. This, as will be noted, locates line 2 2 'm its correct rela- tive position.
Sheet-metal work
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
