. Cyclopedia of architecture, carpentry, and building : a general reference work .... Fig. 86. length on similar line in Fig. 83. For the pattern take the dis-tance of 1 10 and place it as shown by 1 10 in Fig. 85. Using 1as center, and 1 2, Fig. 83, as radius, describe the arc 2 in Fig. 85;intersect it by an are struck from 10 as center and 10 2, Fig. 84,as radius. Then using 10 9 in Fig. 83 as radius, and 10, Fig. 85, as 159 88 SHEET METAL WORK center, describe the arc 9, and intersect it by an arc struck from 2as center, and 2 9, Fig. 84, as radius. Proceed in this mannerusing alternately a
. Cyclopedia of architecture, carpentry, and building : a general reference work .... Fig. 86. length on similar line in Fig. 83. For the pattern take the dis-tance of 1 10 and place it as shown by 1 10 in Fig. 85. Using 1as center, and 1 2, Fig. 83, as radius, describe the arc 2 in Fig. 85;intersect it by an are struck from 10 as center and 10 2, Fig. 84,as radius. Then using 10 9 in Fig. 83 as radius, and 10, Fig. 85, as 159 88 SHEET METAL WORK center, describe the arc 9, and intersect it by an arc struck from 2as center, and 2 9, Fig. 84, as radius. Proceed in this mannerusing alternately as radii, first the divisions in the half profile1 8 5, Fig. 83, then the length of the proper hypoteiiuse in , then the divisions in 6 8 10 in Fig. 83; then again the hypot-enuse in Fig. 84 until the line 5 6 in Fig. 85 has been obtained,which is equal to 5 6 in Fig. 83. Laps should be allowed forriveting and seaming as shown. C-K). PLAN Fig. 87. In Fig. 86 is shown a perspective of an offset connectinga round pipe with an oblong pipe, having rounded corners. The first step is to properly draw the elevation and plan asshown in Fig. 87. Draw the horizontal line A B equal to oneinch, B 5 one inch, and from 5 at an angle of 45° draw 5 0 equalto 2^- inches and 0 C 1^ inches. Make the diameter C D 2| inchesand D TO 1| inches. Make A 1 ^ inch and draw aline from 1 to 160 SHEET METAL WORK 89 10 which completes tlie elevation. Directly above the line A Bdraw .the section of the oblong pipe, making the sides 1 1 and 5 5equal to 1-J inches, to which describe the semicircles on each endas shown. In similar manner draw the section on D C, which isshown by 6 8 10 8. A duplicate of the oblong pipe is also shownin plan by E F, showing that the centers of the pipe come in oneline, making both halves symmetrical. The patterns for the pipes will first be obtained. Divide thesemicircular ends of the oblong section into equal parts
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