. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . bottom are struck from the fourcenters shown by a in the plan, the radius of the arcs forthe corners of the bottom, as shown by aj, being iy2inches- Draw the perpendicular lines am and an, thenextend the side AD of the elevation until it intersects theline am in the point E, which gives the height of thecones, portions of whose frustums are to form the cornersof the finished article. Next, by the l
. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . bottom are struck from the fourcenters shown by a in the plan, the radius of the arcs forthe corners of the bottom, as shown by aj, being iy2inches- Draw the perpendicular lines am and an, thenextend the side AD of the elevation until it intersects theline am in the point E, which gives the height of thecones, portions of whose frustums are to form the cornersof the finished article. Next, by the line Fb, divide theplan into two equal parts, then divide one of the outerquarter-circles into a convenient number of equal parts,as shown by the figures 1 to 5. To lay out the half-pattern for the body, first draw theline HI equal in length to HI in the plan, and at rightangles to this line draw the lines He and le, equal inlength to AE in the elevation. Make HJ and IK equalto the slant height of the side shown by AD in with e and e as centers and radii equal to eK andel, describe the arcs 1-5 and Ku, also the arcs HG andJt. Starting at points H and 1, step off the stretch-out. Figure 205.—Method of Obtaining Pattern for Frustum of Right Cone. 252 SHEET METAL WORKERS MANUAL of the arcs of the pattern, making 1-5 and HG equal inlength to the quarter-circle shown in the plan by the fig-ures 1 to 5. From points 5 and G, draw lines to the centers e and a,and at right angles to these lines, draw the lines GF andtd on the left, and 5b and uc on the right, equal in lengthto one-half the straight end of the pan, shown by FG inthe plan. Connect these points and add laps for wiringand seaming. The pattern for the bottom is found bymerely adding to the outline of the bottom shown in theplan, the allowance required for the double seam. Pattern for Frustum of Bight Cone.— The problems inradial developments up to this point have been what wemight call articles in the form
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