单词 | filtering stone |
释义 | > as lemmasfiltering stone filtering stone n. a porous stone used to filter water; any of various types of stone used for this purpose. ΘΚΠ the world > physical sensation > cleanness and dirtiness > freedom from impurities > removal of impurities > filtering or percolating > [noun] > filter or percolator > stone filtering stone1745 dripstone1792 1745 New Gen. Coll. Voy. & Trav. I. 555/2 In Laguna, where the Water is not clear, they depurate by filtering Stones. 1821 J. Smyth Pract. of Customs (ed. 2) ii. 234 Filtering Stones,—Duty—for every £100 value. 1864 J. C. Brough & A. J. Cooley Cycl. Pract. Receipts (ed. 4) 640/1 For filtering water on the small scale,..diaphragms of porous earthenware and filtering-stone, and layers of sand and charcoal, &c.,..are commonly employed. 1958 Sci. News Let. 2 Aug. 68/3 Snails are believed to keep spaces between filtering stones open and reduce the chance of clogging. 2005 National Business Rev. (N.Z.) (Nexis) 23 Sept. 52 A hearing before independent commissioners..will determine if the airport can continue to channel waste water into sumps in the ground that are surrounded by filtering stones and sand. < as lemmas |
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