1. Avoid abrupt changes in curvature by placing the short radius of the french curve toward the short radius portion of the line to be drawn.
2. Change your position around the drawing board when necessary so that you can work on the side of the french curve that is away from you
3. You should avoid working on the "under" side of the french curve.
4. Place the french curve so that it intersects at least two points of the curve. 3 points is always recommended.
5. When drawing the curve along the edge of the french curve, stop short of the last point intersected. Then move the french curve along to intersect two or three more points.
6. Make sure that the edge of the curve connects smoothly with the part of the curve that is already drawn.
7. When drawing irregular curves, you can draw a perfectly smooth curved line by plotting enough points and by drawing in short steps.
1 x Sanko Star Clear Plastic Technical Geometry French Curve Ruler (Set of 3)