. Cyclopedia of architecture, carpentry, and building : a general reference work .... Emerson ventilator has a flat disc for ahood it is improved by placing a cone and deflector on the topas shown. To make the iDatterns, proceed as shown in Fig. draw the center line a 5, on either side of which lay off 102 SHEET-METAL WORK 43 1| inches, making the pipe A, 3 inches in diameter. The ruleusually employed is to make the diameter of the lower flaTe andupper hood twice the diameter of the pipe. Therefore make thediameter oi s d 6 inches. From s and(7, draw a liiie at an angle of 45° to inte
. Cyclopedia of architecture, carpentry, and building : a general reference work .... Emerson ventilator has a flat disc for ahood it is improved by placing a cone and deflector on the topas shown. To make the iDatterns, proceed as shown in Fig. draw the center line a 5, on either side of which lay off 102 SHEET-METAL WORK 43 1| inches, making the pipe A, 3 inches in diameter. The ruleusually employed is to make the diameter of the lower flaTe andupper hood twice the diameter of the pipe. Therefore make thediameter oi s d 6 inches. From s and(7, draw a liiie at an angle of 45° to inter-sect the line of the j)ipe at t and ^/ thiscompletes B. Measure 2 inches abovethe line t i and make u di the samediameter as s d. Draw the bevel of thedeflector so that the apex will be ^ inchabove the line t i and make the apexof the hood the same distance above u mas the lower apex is below it. Then drawlines as shown which complete C and D. Fig. 39. Now with c as a center and radii equal to c e and c d draw thequarter circles ef and d h respectively, which represent the one-.
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