. 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 . anner. Another style of lip is shown by abgh in elevation, andincloses about three-fourths of the circumference of themeasure. The top is cut off as shown by the dotted lineag. The method of laying out the pattern for a lip of thisform is shown in D, and is obtained as follows: Drawcenter line AB. Set the compasses to a radius equal tothree-quarters of the diameter of the top of a as c
. 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 . anner. Another style of lip is shown by abgh in elevation, andincloses about three-fourths of the circumference of themeasure. The top is cut off as shown by the dotted lineag. The method of laying out the pattern for a lip of thisform is shown in D, and is obtained as follows: Drawcenter line AB. Set the compasses to a radius equal tothree-quarters of the diameter of the top of a as center, describe the arc bed. Next set off thewidth ce, and make the distance cm equal to one-half thediameter of the measure. With m as center and me asradius, describe an arc intersecting the arc bd. Cut offthe end of the pattern as shown, making fg equal in widthto gh in the elevation. Add allowances for wiring or hem-ming the top, thus completing the approximate patternfor the lip. CHAPTER IX DOUBLE SEAMING, PEENING, AND RAISING The next problem of this series is the covered pailshown in Figure 175, the construction of which involvesthe processes of cutting, notching, wiring, seaming, and. Figure 175.—One-Quart Covered Pail with Bottom Double Seamed. burring, the same as the sheet metal cup described inthe last chapter. The construction of the body is practically the same,the only difference being that the bottom of the pail isdouble seamed to the body, instead of being slipped overthe side as was done in constructing the cup. When thebottom of any sheet metal article is to be joined to thebody, the diameter of .which is 4 inches or larger, it isgenerally double seamed, either by hand or machine. Theoperations are fully described and shown in constructingthe problem as follows: 207 208 SHEET METAL WORKERS MANUAL
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