Blessing, George F. (George Frederick), 1875-1921, Darling, Lewis A. (Lewis Andrew) · New York, J. Wiley & sons; [etc., etc.] · leaf 34
Fig. 9. —Ordinary Irregular(French) Curves. 12. Irregular Curves. The irregular or French curves are used as a guide to the pen or pencil in drawing curved lines that cannot be conveniently or accurately made with the compasses. French curves are made of the same materials as triangles, and the…
Mechanical drawing
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