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 776
two disks, held together by a spiral spring firmly enough to hold the thread inflexibly and to draw itthrough the fabric to a definite distance, until more is required to make a new loop. The strain isthen relieved by a small rod striking against the lower end of another rod attached to the upper…
Mechanical engineering -- Dictionaries
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