| 单词 | rack spring |
| 释义 | > as lemmasrack spring rack spring n. a spring attached to a rack in a mechanical device, esp. the movement of a clock. ΚΠ 1867 Sci. Amer. 6 July 13/2 65,941.—Forging Apparatus.—John Price, N. Y. City. 1st, I claim the combination with the hammer head of a rack spring and sliding catch, substantially as and for the purpose set forth. 1892 F. J. Britten Watch & Clockmakers' Handbk. (ed. 8) 87 If the spring is weak and the rack spring strong, it sometimes gives a little. 1999 J. Greenlaw Longcase Clocks 12 The snail wheel rotates once every twelve hours, and the twelve different distances between its outer rim and the centre dictate how far the rack tail can be driven upwards by the rack spring. < as lemmas |
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