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 150
3 THREADS PER INCH Fie. 149 figures intersect is a point of the curve desired. Thesame method is used in finding a curve of intersection MECHANICAL DRAWING 14 … Fig. 150
Mechanical drawing
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