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Appletons' cyclopædia of technical drawing (1896)
Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 406
J ©i m ©r ^^1^ ■o.^.o^.r^.^. Fig. 908. Figs. 910, 911, and 912 are sections of angular connections by flanging theplates. The iron should be good and the curvature easy; inside radius at leastfour times the thickness of the plates. r\ ^-^ r~\.Mechanical drawing
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