. 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 . Figure 199.—Development of Pattern for Pitched Cover : s3 Section ofSteel Square and Method of Use in Laying Out Pattern. terial used is No. 26 galvanized iron and a No. 8 wire isinclosed in its upper edge. An edge *4 inch in width isused for the grooved side seam, and the bottom is attachedto the body by a double seam in the usual way. The bodyis strengthened by several ogee beads. Tinned malleabl
. 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 . Figure 199.—Development of Pattern for Pitched Cover : s3 Section ofSteel Square and Method of Use in Laying Out Pattern. terial used is No. 26 galvanized iron and a No. 8 wire isinclosed in its upper edge. An edge *4 inch in width isused for the grooved side seam, and the bottom is attachedto the body by a double seam in the usual way. The bodyis strengthened by several ogee beads. Tinned malleableiron handles are placed in position on the side as shownin the illustration. Pattern for a Pitched Cover.—Figure 199 shows themethod of obtaining the pattern for the pitched cover, 244 SHEET METAL WORKERS MANUAL which is in the form of a complete cone and is made intwo pieces. First, draw the half elevation as shown byABC. Make AB equal to the altitude and BC equal toone-half the diameter of the cover. With BC as radiusand H as center, describe the arc FG; then HFG willrepresent a one-quarter plan view of the cover, Withm as center and radius equal to AC, describe the arc noof the half
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Keywords: ., bookcentury1900, bookdecade1910, bookidsheetmetalwo, bookyear1918
