Home instruction for sheet metal workers . agram either case the girth lines d eor m n are drawn at right anglesto the face of the molding, andintersections obtained as shown bythe dotted line. To show the principle involved,let A represent a portion of theprofile of the cornice. Open thebevel to the required width asnoted at the building when measurements were taken, andplace it in the position a B C. Bisect the angle in the usualmanner by the arcs a b c and draw the miter line B D. At anypoint on the line B C as C, draw the wall line C N. Divide theprofile A into equal spaces from 1 to
Home instruction for sheet metal workers . agram either case the girth lines d eor m n are drawn at right anglesto the face of the molding, andintersections obtained as shown bythe dotted line. To show the principle involved,let A represent a portion of theprofile of the cornice. Open thebevel to the required width asnoted at the building when measurements were taken, andplace it in the position a B C. Bisect the angle in the usualmanner by the arcs a b c and draw the miter line B D. At anypoint on the line B C as C, draw the wall line C N. Divide theprofile A into equal spaces from 1 to 16, from which drop lines tothe miter line B D. From these intersections parallel to B C linesare drawn intersecting the wall line C N. For the pattern draw the line E F at right angles to B C, uponwhich place the girth of the mold A. Through the small figureson E F at right angles to it draw measuring lines, intersectedby lines drawn at right angles to B C from similar numberedintersections on the miter line B D and butt line C N. A line. Fig. 514. Method of Making Allowance for Projection. 356 Home Instruction for Sheet Metal Workers traced through points thus obtained, as G H J K, will be the mitercuts required for the bay in Fig. 513. Tlie measuring line / inthe cornice H is shown by / in the cornice A, Fig. 515, the meas-uring point in the pattern will be from / to / in length, as pre-viously figured. After the sides have been laid out, cut, formed and solderedtogether in the shop, theyare sent to the building, andif not too awkward to handlethe three sides in Fig. 513are set together at the build-ing, and then fastened to therough framing, starting withbase G, then mullions E andF, and then cornice H, afterwhich the gutter and roofare covered, and the leaderconnections made from thegutter, as explained in theexercise on Leader , however, the sides are ofsuch size as to prevent themiters from being joined be-fore being set, then eachpiece must be carefully set, usi
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
