. Cyclopedia of architecture, carpentry, and building : a general reference work .... nesto intersect 1 1 at 2 3 4, etc. The slant line 1 1 is the cor- 195 124 SHEET METAL \YORK rect stretchout for the middle section B. At right angles to d cdraw J K equal to 1 5 1 in (R), as shown by similar figures inJ K, throucT-h which draw lines at ricrht J K, and inter-sect them by lines drawn at right angles to d e as shown. Tracethe curved lines to produce OPUS, which is the pattern for the middle section, to which flanges are al-lowed as shown by dotted lines. The perspective of an intersec
. Cyclopedia of architecture, carpentry, and building : a general reference work .... nesto intersect 1 1 at 2 3 4, etc. The slant line 1 1 is the cor- 195 124 SHEET METAL \YORK rect stretchout for the middle section B. At right angles to d cdraw J K equal to 1 5 1 in (R), as shown by similar figures inJ K, throucT-h which draw lines at ricrht J K, and inter-sect them by lines drawn at right angles to d e as shown. Tracethe curved lines to produce OPUS, which is the pattern for the middle section, to which flanges are al-lowed as shown by dotted lines. The perspective of an intersectionbetween pipes having different diam-eters in boiler work is shown in ^Vhile the method of obtainingthe j)atterns is similar in principle toparallel line developments, a slightchange is required in obtaining theallowance in the stretchout for the thickness of the metal in A B, Fig, 134, represent the part section of a boiler struckwith a radius equal to 3| and let 1 7 7^ 1° be the elevation of theintersecting pipe, whose inside diameter is 4^, as shown by 1 Fig.
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