| 单词 | riffle board |
| 释义 | > as lemmasriffle board C1. General attributive (chiefly in sense 4), as riffle bed, riffle board, riffle sluice, etc. See also riffle box n. at Compounds 2. ΚΠ 1854 E. S. Capron Hist Calif. iii. i. 209 This riffle-board has sides about four inches high, and riffles like those in the plank sluice; but placed much nearer to each other. 1877 R. W. Raymond Statistics Mines & Mining 349 About one-half of the ore going through the mill is saved by means of riffle-sluices. 1882 Rep. Precious Metals (U.S. Bureau of Mint) i. 570 The finer particles of dirt and dust being thrown away by the current behind before falling on the riffle-bed. 1909 R. H. Richards Text Bk. Ore Dressing xii. 322 This consists of a triangular prism with equal faces, each of which is a riffle sluice supplied with cross riffle bars and side retaining walls. 1968 R. F. Adams Western Words 250 Riffle bar..Also called riffle, riffle block. 2003 K. Martin Midnight Sun 39 I can build us a sluice box. We'll need wire mesh, stuff for a riffle board, and a two- or three-horse engine for vibration. < as lemmas |
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