Science for beginners . L Hook entering the loop of the needlethread. BOBBIN CASEROTATING HOQJ 2. Loop of needle thread en-closing bobbin case. Fig. 279.—How a rotary hook makes the knot. speed.

Download this stock image: Science for beginners . L Hook entering the loop of the needlethread. BOBBIN CASEROTATING HOQJ 2. Loop of needle thread en-closing bobbin case. Fig. 279.—How a rotary hook makes the knot. speed. Owing to the ease with which a chain-stitch seam maybe ripped, and the liability of a stitchs being broken by ac- 460 MACHINES, WORK, AND ENERGY cident, the chain-stitch seam is not regarded as satisfactoryfor many purposes.. H0TATIN0 H00H 3. Under thread enclosed by needle thread. 4. Stitch completed.Fig. 280.—How a rotary hook makes the knot. 539. Classes of Lock-stitch Machines.—Lock-stitch ma-chin - 2ANE9KC from Alamy's library of millions of high resolution stock photos, illustrations and vectors.

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