Polar Curve French Curves
A Polar Spiral French curve, or irregular curve, is used to draw engineering diagrams and steam curves, and is plotted by using the polar equation.
KeywordsRuler, rulers, curve ruler, curved ruler, curve rulers, Polar Curve French Curves, Polar Curve Irregular Curve, polar curve ruler, polar equation
GalleriesMechanical Drawing Tools
French, Thomas E A Manual of Engineering Drawing for Students and Draftsmen (New York, NY: McGraw-Hill, 1911)