| 单词 | centre rail |
| 释义 | > as lemmascentre rail centre rail n. a rail or strut that is located centrally in relation to other components of the device or apparatus of which it is a part; (in a railway or tramway system) a third rail located between the other two rails.In early railway systems a central rail was often used to provide a means of gaining additional traction for use in the ascent and descent of steep inclines. ΚΠ 1825 London Jrnl. Arts & Sci. 9 188 Every key of an upright piano-forte..is to be furnished with the mechanism here shewn; a is the key supported, and vibrating upon the centre rail, as usual, with a pin passing through it. 1832 Amer. Railroad Jrnl. 6 Oct. 641 You may place a stationary cogged wheel on the centre of the axle, to receive the cogged segment on the centre rail. 1907 Pop. Mech. June 655/2 If desired the center rail can also be used as an electric third rail. 2013 M. Griffiths Woodworking in Weekend 118 One more part is needed to keep the table rigid, and that is its center rail that runs between and connects the two X-frames. < as lemmas |
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