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 . by extend-ing lines develops the pattern. If you take some particularnumbered point on the plan and follow the line from thatpoint up to the miter line of the elbow, thence out to the de-velopment to the same numbered line, you will readily seehow that particular point is secured on the development, but MISCELLANEOUS PROBLEMS IN LAYING OUT 177 for the benefit of the uninitiated we will proceed to explainstep by step. First, erec
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 . by extend-ing lines develops the pattern. If you take some particularnumbered point on the plan and follow the line from thatpoint up to the miter line of the elbow, thence out to the de-velopment to the same numbered line, you will readily seehow that particular point is secured on the development, but MISCELLANEOUS PROBLEMS IN LAYING OUT 177 for the benefit of the uninitiated we will proceed to explainstep by step. First, erect the perpendicular line 6 from thebottom plan to 6 on the top plan, then draw center line ofthe angle you wish to make the elbow, in the drawing it is120 degrees from the horizontal line Rx-R^-R^ to Ru, ex-tend the dotted lines Ri and Rn until they intersect at X,these lines being at right angles to the center lines of the el-bow, with X as a center draw arc Ri to Rn also arcs oncenter line and inside line of the elbow. Space the arc Ri toRn into six equal spaces, set off on the arc one-half of asingle space, and from that point step ofif five full spaces and. o o o 0/o / o oo o Ra, Y of the bottom plan as radius, set this distance from^ to C on B, and with C as a center, swing the arc A, B, C,D, E, F, G, and with yi of the top plan oi H, 6 to 11, draw this54 circle to the left of the line i to C, space this into equalspaces same as top plan and number i to 6; drop hnes parallelto I, C down to arc which gives you points on arc of A, B,C, D, E, F, from these points extend lines parallel to A toSec. B, then draw lines from top plan of H down to wherethey intersect lines from S^ as you will see by the drawingthe lines 5 and 6 of // do not run into Sec. B, but drop on toSec. C, likewise lines from E, F, of B^ are not extended
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
