Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 138
Fig. 46. line, proceed as follows: In Fig. 46 let A and B represent respect-ively a two- and three-pieced elbow for which patterns are desired.First draw a section of the elbow as shown at A in Fig. 47 which r-I t__. … ^^_y Fig. 47, is a circle 3 inches in diameterj divide the lower half into equalspaces and number the points of division 1 to 7. Now follow therule previously given: The top and bottom piece equals 2; then 107 48 SHEET-METAL WOKK for a two-pieced elbow divide 90 by 2. In its proper i)osition…
Architecture · Building · Carpentry
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