This section is from the "Hand Sewing Lessons" book, by Sarah Ewell Krolik. Also available from Amazon: Hand Sewing Lessons: A Graded Course For Schools And For The Home.
Gingham, 5 inches square.
(a) Cut a right-angle triangle from the gingham. To do this, begin at middle of one side and cut diagonally through the checks across one corner, fold back the cut edges to match, see that the warp is parallel, and overhand.
Illustration 25. Gingham matched. Represents Model 16 (Bias And Corner Matching).
(b) Cut a 2 inch square from the opposite corner, fold back the edges to a color line in the gingham, match the square in place as in illustration 25, and overhand.