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 91
pan-ing ; when flatness or truth is the end sought, the operation is termed straightening. In pening,very light strokes are given, so as to cause the effects of the blows to remain at or near the surfaceof the metal. But in straightening, heavier blows are delivered, and the effects penetrate the… … 2249. 2250.
Mechanical engineering -- Dictionaries
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