A three cornered tear may be darned in two ways. Commence by darning
diagonally through the center, darning back and forth towards the end of
the tear until one-half has been finished; then begin at the center and
work in the opposite direction. At the corner, the stitches should form
the shape of a fan. Another method which is stronger, is done by darning
a square in the angle, first with the warp threads, then with the woof
threads, and finishing each end across the tear.