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 29
TRIANGULATION 20 oblique cone with a number of right Hnes upon its sur- face is suspended directly above the horizontal surface A B C D. The method of securing a plan of said cone should be apparent from lines shown. As will be noted, the foot of the perpendicular line EE' is a plan of the … Fig. 15. An Oblique Cone Having a Number of Right Lines Upon Its Surface, and Its Plan. vertex E, and the foot of each perpendicular let fall from the numbered points of the base is the plan of its respec- tive point. Since lines shown upon the surface of the cone are right lines, and converge to…
Sheet-metal work
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