Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 769
as been explained that the roarv-hook machine makes its lock stitch by transporting the loopof thread over a fixed bobbin. The hook or looper for this purpose is of peculiar form, as shown atA, Fig. 3836, the tail or guard overlapping the point, so that the under thread from the bobbin Ccannot… … SEWING MACHINES. 737 to be carried around the lower thread without disturbing the position of the bobbin, and preventsthe loop from being cast off the hook into the wide mouth of the bobbin instead of passing around 3S37. 3836.
Mechanical engineering -- Dictionaries
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