Mechanical drawing; a treatise on the drawing of mechanical and machine details (1920)
Jones, Franklin Day, 1879-1967 · New York, The Industrial press; [etc., etc.] · leaf 57
Fig. 16. Different Angles which may be laid off by using the 45- and30- by 60-degree Triangles than circles or arcs. Curves are generally made of celluloidand in a great variety of sizes and forms. The curves maybe parts of ellipses, spirals, parabolas, or other curves. Forspecial purposes, they… … Fig. 17. Simple Form of Protractor One elliptical and one spiral curve will serve for general pur-poses. In practice, the points through which a. curved lineis to be drawn are located and then the edge of the irregularcurve is made to coincide with as many of these points aspossible and a smooth…
Mechanical drawing
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