Triangulation short-cut layouts: a textbook and working guide with practical and modern methods for laying out and forming patterns used for blower-exhaust systems, heating and air conditioning. Mathematical formulas applied to sheet-metal work

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Bruce Pub. Co., 1948 - Crafts & Hobbies - 290 pages
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Dividing Quarter Circles
Simple Method for Dividing a Line Into Equal Spaces
Dividing Into Six Twelve or TwentyFour Equal Spaces

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