Deloas Boomerangs

The concave and convex sides of this ruler are the same so both sides can be used so crosshatching and continuous curve can be done without crossing the hands. Mark a line at the angle you are going to stitch your arcs. Line up the middle line of the ruler with your drawn line and stitch. Match your stitching line to a curved measured line on the ruler to make your next curve, be sure to match the center line with each stitching.