Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . FIG. 6.—PATTERN FOR THROAT. PATTERN FOR BACK. FIG. 5. and side sheet.~ are worked down in the center on a hollowblock between tlie points LL, il/.l/ and 00. In working downthe centers, the edges of the sweep will rise to the edges of the throat-piece are peened to the sweep of thecurve and the center filled out afterwards. The four piecesare then rounded up and planished on suitable heads, fittedtogether, riveted,
Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . FIG. 6.—PATTERN FOR THROAT. PATTERN FOR BACK. FIG. 5. and side sheet.~ are worked down in the center on a hollowblock between tlie points LL, il/.l/ and 00. In working downthe centers, the edges of the sweep will rise to the edges of the throat-piece are peened to the sweep of thecurve and the center filled out afterwards. The four piecesare then rounded up and planished on suitable heads, fittedtogether, riveted, and a finishing bead put on the edge. Fig. 7 shows the front view of the throat piece worked intoshape. This is the most difficult to make, and care is re-quired in its manipulation. In making the cowls of sheetcopper, very little work is is performed before brazing. Thepattern sheets of the throat and back are bent to the work-ing lines, as shown in Fig. 3. the edges are worked over about. FIG. 7.—FRONT VIEW OF THROAT WORKED TO SHAPE. may be proportioned to suit the judgment of the designer, orthe requirements of a case, by simply altering the pitch ofthe axial plane. The principal features in this method, whichwill recommend its use, are: The simplicity of developmentof the outlines and patterns, the absence of cross-sectionalseams, a uniform thickness of metal throughout the cowl,and the saving of time, labor and material. A cowl madefrom this method does not look as though it had been con-structed from the scrap heap, but gives a finished appearancewell worth trying for in an up-to-date steam vessel. Developing a Cylinder Intersecting an Elbow by theMethod of Projection. Though this method involves a large amount of work, theresult gained more than compensates for the time taken toexecute the drawing, for it shows step by step how and whythe plan is divided into equal spaces, which in turn by extend-ing lines develops the pattern. If you take some particularnumbere
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
