. Cyclopedia of architecture, carpentry, and building : a general reference work .... !!4, ^/// ^I, / / / 11 I I I /o;..u I ELEVATIONW. Fig. to know how the side of the tapering elbow would look,take a tracing of N O K J, reverse it and place it as shown byJ W M K. For the pattern i^roceed as follows: With L as a center andL H as a radius describe the arc 1 1. Starting from 1 set off on 112 SHEET-METAL WORK 53 this arc twice the stretchout of 1 4 7 in plan, as shown by similarfigures on 1 1, from which draw radial lines to the apex L. Againusing L as center with radii equal to L N,
. Cyclopedia of architecture, carpentry, and building : a general reference work .... !!4, ^/// ^I, / / / 11 I I I /o;..u I ELEVATIONW. Fig. to know how the side of the tapering elbow would look,take a tracing of N O K J, reverse it and place it as shown byJ W M K. For the pattern i^roceed as follows: With L as a center andL H as a radius describe the arc 1 1. Starting from 1 set off on 112 SHEET-METAL WORK 53 this arc twice the stretchout of 1 4 7 in plan, as shown by similarfigures on 1 1, from which draw radial lines to the apex L. Againusing L as center with radii equal to L N, L1, L 2 to L-7, draw arcsas shown intersecting radial lines having similar numbers. Throughthese intersections draw the line J L. Then O N J K Lor A will be the pattern for the upper arm (A) in elevation, andP R T X Y or B the pattern for the lower arm (B) in elevation. «l*\\^ N.^^^^^^- III I i**\ ^ ^ \ \ ^ V ^ ;;. ii\\\\ \ ^s ^
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