A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 43
Figf. 38 … Fig. 39 MECHANICAL DRAWING 41 changing the position of the trammel frequently, suf-ficient points can be located at G, on the trammel, todetermine a symmetric ellipse. Make GC = DH andGE = AH. Exercise ^o.—Make a full-size drawing of the ellip-tic cam. Fig. 40.
Mechanical drawing
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