| 单词 | crown tree |
| 释义 | > as lemmascrown tree crown tree n. a horizontal supporting member; esp. †(a) a ridge piece in a roof (obsolete); (b) a horizontal supporting member in a windmill; (c) a horizontal beam resting on two uprights, supporting the roof in a mine (cf. head tree n. 1). ΘΚΠ society > occupation and work > workplace > places where raw materials are extracted > mine > [noun] > prop or support crown tree1449 punch1462 prop1613 slider1653 sole1653 yoking1653 stow-blade1681 pit-bar1708 fork1747 head tree1747 studdle1758 lock piece1778 pit-prop1794 puncheon1815 stow-fork1824 plank tubbing1839 sprag1841 gib1847 chock1853 Tom1858 bratticing1866 pack1867 breastboard1877 brattice1881 wall-plate1881 strap1883 stretcher1883 1449 Contract in R. Willis & J. W. Clark Archit. Hist. Univ. Cambr. (1886) II. 10 (MED) With a crown tree ix inch of brede viij inch thik. 1466 Contract 25 June in R. Willis & J. W. Clark Archit. Hist. Univ. Cambr. (1886) III. 93 From euery beme a leyrn stood with .ij. braces into the beme and .ij. into the crownetree which shal lye vpon the said studdes. 1634 J. Levett Ordering of Bees 19 If you put your crowne-tree through the crowne of your Hive, you must make it somewhat the longer. 1761 J. Waddington Acct. Bedford Level to 9 January 1761 43 To repair Middle fen bridge... For 1 piece for the crown tree, 10 feet long, 9 inches by 8½, contents 5 feet, 11s. 8d. 1797 J. Curr Coal Viewer 31 1 Estimate of the Expence of the Jinney aboveground, and Scantling for the Wood... 1 Crown tree, 4 feet 10 inches long, and 3½ inches square 1s. 0d. 1805 R. W. Dickson Pract. Agric. I. Pl. xxiv to face p. 64 Mills... The shaft runs through the crown tree or cross bar at the top of the frame, on which is the horizontal flywheel and crank. 1849 G. C. Greenwell Gloss. Terms Coal Trade Northumberland & Durham 20 Crowntrees are best made of larch, as being most durable. 1914 R. A. S. Redmayne Mod. Pract. Mining III. iv. 104 Three sets of timber (‘pairs of gears’, each consisting of a ‘plank’ or ‘crown-tree’ set horizontally and supported by a prop at each end) were kept across the face to protect the coal hewers. 1957 S. Freese Windmills & Millwrighting ii. 21 They can rest on an inwardly inclined rebate on the crown-tree, and can be secured there with dog-irons or rods and bolts. 1994 E. A. Labrum Civil Engin. Heritage: Eastern & Central Eng. (1998) iii. 100 It is carried by two vertical members instead of the usual horizontal side girts at each end of the crowntree. < as lemmas |
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