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 298
springs, which yield under the pressure of the graining board to an extent proportional to the thickness of the leather. By tins means the apparatus is enabled to work upon thin or thick hides withequal facility. Its capacity is from 10 to 12 sides per hour. Motive power required, 1 horse. 2764. … Rolling and Hardening.—After being tanned, hides are dried and rolled to compress and hardenthem. Fig. 2764 shows the usual form of roller, the arm of which oscillates at about 100 doublestrokes per minute. 2765.
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