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 655
le strokes in a minute. R. II. B.* PUNCHING AND SHEARING MACHINERY. The usual effect of perforating iron plates bypunching is a weakening of the metal about the holes, so that the tensile strength per unit of sec-tion between the holes is less than that of the unpierced plate. According to… … * Prepared by T. F. Krajewski, under the direction of R. H. Buel. PUNCHING AND SHEARING MACHINERY. 625 ings of the Institution of Civil Engineers, xxx., 169-70. As to punching steel, see experiments ofJ. G. Smith, ibid., xlii., 76; also Kirks experiments in Proceedings of the Institute of Naval…
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