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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 172

An illustration from Triangulation applied to sheet metal pattern cutting : a comprehensive treatise for cutters, draftsmen, foremen and students ..., 1920, leaf 172
THE HELICAL ELBOW

Sheet-metal work

Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.

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