| 释义 |
diamond-point
[f. diamond n. + point n.]
1. A stylus tipped with a fragment of diamond, used in engraving, etc.
1874Knight Dict. Mech. I. 698/1 Wilson Lowry introduced the diamond-point into engraver's ruling-machines. 1881Every Man his own Mechanic §569 The diamond point..is used for roughing very small and delicate work that will not bear the gouge.
2. Railways. Usually in pl. The set of points at a diamond crossing, where two lines of rails intersect obliquely without communicating, forming a diamond or rhombic figure; in sing. one of the acute angles formed by two rails at such a crossing.
1881Daily News 15 Sept. 3/2 It [a train] had to pass over a diamond point. 1890Morning Post 24 Oct. 6/7 A North British mineral train, while crossing a set of diamond points, ran off the line. 1894Westm. Gaz. 24 July 5/2 On reaching the diamond point the guard's van next the engine jumped the metals.
3. attrib., as diamond-point chisel, a chisel having the corners ground off obliquely.
1874Knight Dict. Mech. s.v. Chisel. |