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 130
TAPERING ELBOW 121 in their correct lengths and positions, now becomes a simple, although a somewhat prolonged operation. In practice it may be well to develop the pattern as the true lengths are secured. This course will very likely render one less liable to error, inasmuch as each length may be… … Fig. 62. Pattern for Center Piece of Elbow. The distance lines are from each other at their ex- tremities is clearly shown upon the mitered ends of the collar patterns, which we shall presume to have been first developed. Since these patterns are but portions of elbows in round pipe, we will pass…
Sheet-metal work
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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