This section is from the book "School Needlework. A Course of Study in Sewing designed for use in Schools", by Olive C. Hapgood. Also available from Amazon: School Needlework: A Course Of Study In Sewing Designed For Use In Schools.
1. Fold and crease the square diagonally from corner to corner.
2. Cut on the crease.
3. From one of the pieces cut two bias strips, each strip being one inch wide.
4. Place the right sides of the strips of calico together, so that the two ends are exactly even (Fig. 82).
Fig. 83. - Showing the right side of a mitred corner.
Fig. 82. - Showing the two ends basted.
6. Press the seam open, and trim the corners (Fig. 83).