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 268
ed to hold work by bein^driven into a hole or bore. They are turned very true and carefully centred and centre-drilledwhen used for lathe-work. After the hardening process, during which they are subject to warping,they are ground by an emery-wheel to true them up. They should be left a trifle… … uu-.-.uuai 1 L^y
Mechanical engineering -- Dictionaries
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