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 . LAYOUT OF FOUR-PIECE 9O-DEGREE ELBOW. dicular to CD. Where the line CD intersects LO, lay off adistance of 12 inches to the point L. Draw the line ABthrough the point L parallel with CD. The course ABCD is all that is required for the transfer ABCD, Fig. i, to A B C D, Fig. a semi-circle on the line YZ and divide it into eightequal parts. Draw horizontal lines from the points i, 2, 3, 4,5, 6, 7, 8 an
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 . LAYOUT OF FOUR-PIECE 9O-DEGREE ELBOW. dicular to CD. Where the line CD intersects LO, lay off adistance of 12 inches to the point L. Draw the line ABthrough the point L parallel with CD. The course ABCD is all that is required for the transfer ABCD, Fig. i, to A B C D, Fig. a semi-circle on the line YZ and divide it into eightequal parts. Draw horizontal lines from the points i, 2, 3, 4,5, 6, 7, 8 and 9, Fig. i, extending them until they intersect theline B D, Fig. 2. On the line B A mark K i inch from the line KD, and then lay off from A the distanceA X equal to i inch. Draw the line XC; then the measure-ments for the development, Fig. 3, should be taken from theselines KD and XC, Fig. 2. To obtain the distance XA run the line C A somedistance above the line XB and then set the dividers withone leg on A and with a radius equal to twice the thickness I and 2. Measure the distance from i-i. Fig. 2, and transferit to i-i. Fig. 3. In a like manner tran
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
