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Lockstitch is so named because the two threads, upper and lower, "lock" (entwine) together in the hole in the fabric which they pass through. Most industrial lockstitch machines sew only a straight line of stitches. — “Lockstitch - Wikipedia, the free encyclopedia”, en.wikipedia.org
Original - Illustration of the mechanical process executed by a sewing machine to create a lockstitch. The only thing I can say, is that this giff was created to show the lockstitch method only. — “Wikipedia:Featured picture candidates/Lockstitch - Wikipedia”, en.wikipedia.org
Elias Howe's lockstitch machine, invented 1845. A sewing machine is a textile machine used to stitch fabric, cards and other material together with thread. Plain stitches fall into four general categories: lockstitch, chainstitch, overlock, and coverstitch. — “Sewing machine - Wikipedia, the free encyclopedia”, en.wikipedia.org