In blind-stitching Fig. 1 shows the first operation of putting in the needle, which must not be drawn out on the top, but backed out about 3 in. farther on the front; note that the needle is double-pointed for this purpose (see Fig. 2). This will leave inside the mattress a loop of twine (see Fig. 3), which, when drawn tight, will secure all the hair contained in the loop or stitch up to the edge of the mattress, thus forming the hard, square edge seen in this class of work.

Fig. I.

Fig. 2.

Fig. 3. Making Hair Mattress.