| 单词 | crown arch |
| 释义 | > as lemmascrown arch crown arch n. Engineering an arch or arched structure forming the roof of a tunnel, kiln, etc.; (also) an arch in the form of a semicircle or larger part of a circle. ΚΠ 1812 Gentleman's Mag. Apr. 384/1 It was the Crown-arch [of the Highgate Tunnel], near Hornsey-Lane, that first gave way. 1844 Lloyd's Weekly London Newspaper 16 June 10/4 I was on the Surrey side of Battersea bridge, and saw a man and woman standing on the crown arch of the bridge. 1847 Ipswich Jrnl. 30 Jan. 4/2 The semicircle is the best curve for crown arches of sewers. 1851 Trans. Highland & Agric. Soc. Scotl. July 1849–Mar. 1851 105 The number of cubic yards of building contained in the walls, crown-arch, chimney-heads, buttresses, and spur-arches of kiln. 1922 Jrnl. Amer. Ceramic Soc. 5 602 The greatest fuel losses [in a kiln] are..the heat radiated from the exterior of poorly insulated side walls and crown arch. 2008 B. Maidl et al. Hardrock Tunnel Boring Machines ix. 135 (caption) Installation of crown arch support with mesh reinforcement. < as lemmas |
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