. 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 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,
. 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 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. Figure 222.—Four-piece 90° Elbow. a blast is not used. Elbows having a large radius in thethroat are generally used for making turns in grain con-veyers, exhaust and blow-piping work. In projects ofthis kind an elbow having a short radius should neverbe used if it can be avoided. The drawings shown in Figure 223 contain all the neces-sary details for development of the patterns for elbowsat any angle, having any number of pieces. The work- 274 cro ©
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Keywords: ., bookcentury1900, bookdecade1910, bookidsheetmetalwo, bookyear1918
