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 216
CHAPTER XXIV. A Two Pronged Fitting Whose Prongs Are Unequal. The chief difficulty which is usually encountered when an attempt is made to develop the pattern for an unequal branched fitting as illustrated at Fig. 101 is to establish … Fig. 101. Photographic View of the Fitting. a suitable form at the junction of its prongs. Therefore our first work will be to discuss methods which may be pursued to establish that form. Upon comparing Fig. 97 in Chapter 23 and 101, it will be noted that one prong of Fig. 101 is a duplicate of 207
Sheet-metal work
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