Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 242
Fie. 131. 194 SHEET METAL WORK 123 from the various intersections, erect lines, which are intersectedby lines drawn parallel to H I from similar numbered intersec-tions on the miter line h c. Trace the curve L ]M. L M I II showsthe pattern for the two end pieces of the elbow. As the middle section… … rirm account of this lap when suitable flanging machines are available;but since it is desirable, in some instances, to make an allowancein the pattern for riveting, the method of allowing for this lapwill be explained. In (R), Fig. 132, lay off on the line E F the distance /Ji nequal to 7 times…
Architecture · Building · Carpentry
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