| 单词 | lower web |
| 释义 | > as lemmaslower web c. Railways. The narrow, upright portion of a rail between its head and the foot. Formerly also: †the head or foot of a rail (more fully upper web and lower web respectively) (obsolete). ΘΚΠ society > travel > rail travel > railway system or organization > [noun] > track > parts and fittings of rails string-piece1789 carriage1816 chair1816 pedestal1816 surface plate1822 web1835 frog1837 switch-bar1837 snake-head1845 fish1847 fish-joint1849 plate nail1849 fishing-key1852 fish-plate1855 joint-chair1856 rail chair1864 railhead1868 lead1871 fish-bar1872 splice-piece1875 fish-plating1881 splice-jointa1884 splice-bar1894 1835 P. Barlow Exper. Transverse Strength Malleable Iron 20 It will be seen..that by introducing what is called a lower web, that weight for weight, a parallel rail may be made as strong as the fish-bellied, with only an additional depth in the chair of three-quarters of an inch. 1838 Civil Engineer & Architect's Jrnl. 1 169/1 The lower web is, in some examples, not so wide as the upper web by nearly half an inch. 1840 H. S. Tanner Canals & Rail Roads U.S. 264 Web, the outer projection of a rail, intended to prevent the wheels of carriages from running off the track. 1886 Encycl. Brit. XX. 225/1 There was a waste of metal in these early rails..owing to the excessive thickness of the vertical web. 1960 Railway World in P. B. Whitehouse Railway Anthol. (1965) iii. 67 The condition of the permanent way was even more depressing. The original wrought-iron rails had worn to such an extent that they were collapsing in the web. 2000 J. S. Mundrey Railway Track Engin. (ed. 3) ii. 31 The thick, sturdy web of the rail is designed to give the rail adequate shear strength to guard against failure. < as lemmas |
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