. Cyclopedia of architecture, carpentry, and building : a general reference work .... adii,first the divisions in a in Fig. 103, then the slant lines in ; the divisions in c in Fig. 103, then the slant lines in Fig. 168 SHEET METAL WORK 97 104, until the line 1 8, Ficr. lOG, is obtained. Now using 8 ascenter and 8 9, Fig. 103, as radius draw the arc 9 in Fig. it by an arc struck from 1 as center and 1 9, , as radius. Then starting at 1 in Fig. 106 use alternately asradii, Urst the divisions in h in Fig. 108, then the slant lines inFig. 105, the divisions in a in
. Cyclopedia of architecture, carpentry, and building : a general reference work .... adii,first the divisions in a in Fig. 103, then the slant lines in ; the divisions in c in Fig. 103, then the slant lines in Fig. 168 SHEET METAL WORK 97 104, until the line 1 8, Ficr. lOG, is obtained. Now using 8 ascenter and 8 9, Fig. 103, as radius draw the arc 9 in Fig. it by an arc struck from 1 as center and 1 9, , as radius. Then starting at 1 in Fig. 106 use alternately asradii, Urst the divisions in h in Fig. 108, then the slant lines inFig. 105, the divisions in a in Fig. 103, then the length of theslant lines in Fig. 104 until the line 12 13 is obtained in Fig. 106,which equals 12 13 in Fig. 103. Trace a line through points thusobtained in Fig. 106, then will 4 1 13 12 9 8 5 be the half the pattern is desired in one piece, trace this half opposite theline 4 5 as shown by 1 13 12 9 8, allowing laps for riveting. In Fig. 107 is shown a perspective view of a tapering flangearound a cylinder passing through an inclined roof, the flange. a 6 5 Fig. 106. Fig. 107. being rectangular on the roof line. The problem will be developedby triangulation, a plan and elevation first being required as shownin Fig. 108. First draw the angle of the roof A B at an angle of 45°,through which draw a center line C D. From the roof line A Bon the center line set off a h equal to 4 inches and through h drawthe horizontal line E F, making B F and B E each one d on the center line draw the horizontal line G II, making(I H and d G each two inches. From H and G erect perpendicularsintersecting the roof line at K and L. Then draw lines from E toK and F to L, completing the elevation. Construct the square inplan making the four sides equal to G H. Bisect H I and drawthe center line c e intersecting the vertical center at d. Then withradius equal to Z* F or ^ E in elevation and d in plan as center, 169 98 SHEET METAL WORK draw the circle 1 4: 7 4
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