Science for beginners . PRESSER FOOT POINT Qf LQOPER. OF LOQPEI POINT OF LOOPER Fig. 277.—How a chain-stitch machine forms the knot, sewed by means of the chain stitch is elastic, while the lock-stitch seam is not. 4. The chain-stitch machine can be oper-ated satisfactorily at a higher speed than the lock-stitch 458 MACHINES, WORK, AND ENERGY

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscience, bookyear1921