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 122
CHAPTER XV. A Three Pieced Tapering Elbow. The solution of the problem here presented should in- terest the pattern cutter, although the demand for a fitting of this class is limited. An endeavor is made in this example to satisfy a popular demand for something out of the ordinary. Therefore the… … Fig. 59. Photographic View of Three-pieced Tapering Elbow. as flat on one side. This necessitates the developing of the pattern for the whole irregular portion, as one half cannot be duplicated for the other. In examples of this nature there are no additional principles to be applied, but it adds…
Sheet-metal work
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
