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.
Half-backstitching is the same as stitching, except that the needle is put only half-way back, thus leaving a space between the stitches (Fig. 17).
How does half-backstitching differ from stitching?