Industrial drawing and geometry; an introduction to various branches of technical drawing (1911)
Spooner, Henry John, 1856- · London, New York [etc.] Longmans, Green, and co. · leaf 104
n. 162. The Helix.—If you cut out of a piece of paper a right-angled triangle ABC (Fig. 2.50), making its base AB equal inlength to the circumference of a cylinder = dir, where d is its diameter, and wrap the triangle round the cylinder, the hypote-nuse BC will form a curve BE2C2 (winding round the… … 11 10 9 8 7 6 S + 3 2 I I CtrcitMuerence =air n
Mechanical drawing · Geometrical drawing
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