Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 139
^^_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… … Fiff. 48. SECTION sliown. In line with B C draw K L upon which place twice thenmnber of spaces contained in the section A as shown by similarfigures on K L; from these points drop perpendiculars to intersect 108 SHEET-METAL WOKK 49 with lines drawn from similar intersections on E D, iparallel to K…
Architecture · Building · Carpentry
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