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 22
r is equal to the major diameter of the polygon. However, since eight parts are too few to divide a circle into, we would have divided that circle into a greater number. The author has found sixteen to be quite effective, although a still greater number will more closely approximate the circle. A… … c D Fig. 12. The Plan of the Fitting Illustrated in Fig. 11. base, and its center located as at w. With point w as center, a circle is drawn equal to the required diameter of the top, as shown a.t 1 2 3 4, etc. Since this is an example of Triangulation, the surface of the object is presumed to be…
Sheet-metal work
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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