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 . this pattern. 172 LAYING OUT FOR BOILER MAKERS The Lay Out of a Four=Piece 90=Degree Elbow withLarge and Small Ends on Each Course. Draw the lines EO and YO. Fig. i; then with 0 as a centerand with the trammels set to a length of 12 inches, draw thequarter circle FCZ. With the same center and with the tram-mels set to a length of 24 inches, draw the quarter circleEAY. Divide the quarter circles FCZ and EAY, respectively,into six
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 . this pattern. 172 LAYING OUT FOR BOILER MAKERS The Lay Out of a Four=Piece 90=Degree Elbow withLarge and Small Ends on Each Course. Draw the lines EO and YO. Fig. i; then with 0 as a centerand with the trammels set to a length of 12 inches, draw thequarter circle FCZ. With the same center and with the tram-mels set to a length of 24 inches, draw the quarter circleEAY. Divide the quarter circles FCZ and EAY, respectively,into six equal parts. Draw lines from C to D, A to O and Bto O. Also draw the line LO through the point H perpen- of the iron locate a point G. Then, with one leg of thedividers on C and a radius equal to C G, draw the arcintersecting XB at X. Then with one leg of the dividerson B and a radius equal to A X draw an arc to thepoint K. Draw the line L H, Fig. 3, 38 inches long, and divide itinto sixteen equal parts. Draw lines through these points ofdivision at right angles to L H. Mark these lines with thesame numbers as were used for the corresponding points, Figs. .KS.
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
