| 单词 | roach bed |
| 释义 | > as lemmasroach bed b. A bed of white limestone in the upper Jurassic strata of southern England; a variety of Portland stone obtained from this bed. Frequently attributive in roach bed. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > limestone > type of mailley1747 madrepore1809 limestone1813 roach1813 madrepore marble1839 majolica1866 post rock1958 the world > the earth > structure of the earth > constituent materials > stone > [noun] > freestone or building stone Caen-stone1421 french peirec1620 Portland stone1633 grison stone1653 hazle1794 roach1911 society > occupation and work > materials > raw material > stone or rock > [noun] > building stone > types of limestone for building Purbeck stone1410 Tiburtine stonec1440 toph stonea1552 travertine1669 Purbeck1683 Purbeck marblea1697 Portland1711 tiber-stone1726 tophus-stone1830 Hopton wood1888 roach1911 1813 Monthly Mag. Jan. 481/2 In the adjoining quarry immediately under the cap (4) is Roach (a mass of the fragments of oyster shells compressed and cemented in a very hard stone), six feet thick, upon a bed of the best saleable stone nine feet thick. 1839 Civil Engineer & Architect's Jrnl. 2 375/2 The roach beds are always incorporated with the freestone beds that invariably lie below them. 1873 Manufacturer & Builder Jan. 22/2 The best [concrete] is to be made from hard, coarse-grained sandstone, or from some of the beds of the oolite, as..from the roach beds of the Portland stone. 1887 T. Monk Specif. Patent 1264 1 The roach or rag of Portland stone, at present a wasted natural product. 1911 Encycl. Brit. XXII. 122/1 The Portland limestones have been much in demand for building purposes; at Portland the ‘Top Roach’, the ‘Whit Bed’ or top freestone, and the ‘Best Bed’..are the best known. 2003 Independent 20 Mar. i. 20/2 Structural mullions faced in roach-bed Portland stone. 2003 Guardian 24 May i. 13/7 The sculpture has five terraces, each in a different grade of stone—slate, topstone, roach, whitbed and basebed—just as they occur in the nearby quarries. < as lemmas |
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