Marj learned this technique from Marion Scoular's book "Advice is...." Apparently, Marion's mother taught her the technique. Always listen to Mom!
I don't own this book, having only seen it once and that copy was for display only. Guess I'll add it to my Christmas wish list.
http://www.needleartworks.com/dsgnr/mss/mss3.htm
Thank you, Marj!
By the way, anyone interested in learning more about stitching curves and circles on NP canvas might enjoy reading the late Mary Duckworth's article about this, reprinted on the ANG website from the 1978 Needle Pointers where it originally appeared.
http://www.needlepoint.org/Archives/Circles.php
Main blog at http://blog.360.yahoo.com/chillyhollow