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 . Z HO o g So > o O ob. o o po OS o 176 LAYING OUT FOR BOILER MAKERS the extremities of these lines, draw the outlines of thepatterns for throat and back. In Fig. 2, the dotted lines givethe front view of the cowl. The solid lines show the edgesof the pattern sheets in the flat before being worked intoshape, and on the working lines. In making the cowls of planished iron or steel, the back \S -I- I inch to meet the side pattern
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 . Z HO o g So > o O ob. o o po OS o 176 LAYING OUT FOR BOILER MAKERS the extremities of these lines, draw the outlines of thepatterns for throat and back. In Fig. 2, the dotted lines givethe front view of the cowl. The solid lines show the edgesof the pattern sheets in the flat before being worked intoshape, and on the working lines. In making the cowls of planished iron or steel, the back \S -I- I inch to meet the side pattern and then scarfed. The edgesof the side patterns are then scarfed and cramps cut to receivethe back and throat pieces, as shown in Fig. 9. They arethen fitted together and brazed. After the seams are dressedthe cowl is then rounded up and planished on suitable man-drels and heads. The finishing bead on the edge of the mouth of the cowlis made of a split tube, and is bent to shape around a woodensweep, the radius of the mouth, with a strip of metal in theslit to keep it from closing and also to keep the slit in thecenter. This method of making cowls is very flexible. The cowls KALEVIMAG
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
