August 26, 1871. IMPROVED METHOD OF DRAWING PATTERNS FOR FLAR-ING VESSELS OF SHEET METAL. The invention illustrated by the accompanying engraving,is a new and convenient method of laying out on sheet metalthe necessary lines by which to cut the metal so that it maybe bent into the form of truncated… … I B _ \: c /: 5\ r The line, C D, is equal in length to the long, and the line, E F,to the short diameter of the truncated cone. Both the lastnamed lines are bisected by A B. Lines are next drawnthrough the points, C E and D F, so that the point. G, isfound. An equilateral triangie, E F H, is…
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