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 984
2. Screw or monkey wrenches are those which have a movable jaw, so that the tool may be adjustedto fit any sized nut within its compass. An immense number of such wrenches have been devised. … Fig. 4322 represents one of improved form manufactured by Messrs. L. Coes & Co. of Worcester,Mass., which will serve as an example of the class. The construction of this wrench, which is 4323.
Mechanical engineering -- Dictionaries
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