. 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 220.—Elevation and Partial Development of Pattern for Y-Joint. the half section D into a number of equal parts, beingcareful to place a point on the quarter-circle, as shownby point 4. Draw parallel lines from these points inter-secting the miter lines fb and ba as shown. At rightangles to the arms A and C, draw the stretch-out lines ghand mn, and complete the patterns as directed in the pre
. 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 220.—Elevation and Partial Development of Pattern for Y-Joint. the half section D into a number of equal parts, beingcareful to place a point on the quarter-circle, as shownby point 4. Draw parallel lines from these points inter-secting the miter lines fb and ba as shown. At rightangles to the arms A and C, draw the stretch-out lines ghand mn, and complete the patterns as directed in the pre-ceding problems. Chimney Cap.—Figure 221 shows the elevation of aventilator head, or chimney cap, the pipes being of the IEET METAL WORK AND PATTERN DRAFTING 273 same diameter. This is presented as a test problem, asit involves the development of two problems describedin this chapter. The arms A and B form a T-joint at aright angle, similar to Figure 214, while the arms B and Care joined at other than a right angle, similar to the prob-lem shown in Figure Figure 221.—Elevation of a Chimney Cap, or Ventilator Head. Draw the elevation and half sections as shown in thedrawing. Then develop the patterns for the arms method of development has been fully explained inpreceding cases, so that no further demonstration needbe given. CHAPTER XIV ELBOWS An illustration of a four-piece 90° elbow, which isused universally in heating and ventilating work, is shownin Figure 222. Elbows of this form, having a small radiusin the inner curve or throat, are commonly made use ofin stovepipe work, furnace work, and in duct work where
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