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 983
wrench is formed of a singlepiece of metal, having a notch or openingof suitable shape and size to fit on theobjects to be grasped. It is specifically designated according to the shape of the recess or apertureas a squaic wrench, hexagon wrench, etc. If the openirg is at one end, it is termed a… … 4318. 4319. having an annular recess notched on its sides, so that any nut or bolt which will enter the jaws canbe grasped, is called an alligator wrench, and is one of the most convenient forms. To illustrate,Fig. 4318 is a double-ended square wrench; Fig. 4319, a single-ended square wrench; Fig.…
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