| 单词 | well crank |
| 释义 | > as lemmaswell crank well crank n. a windlass for raising and lowering a bucket in a well. ΘΚΠ society > occupation and work > equipment > lifting or hoisting equipment > [noun] > winch or capstan > over a well well crank1440 winch1556 turnel1578 Promptorium Parvulorum (Harl. 221) 520 Welle crank, tollinum. 1852 Appletons' Mechanics' Mag. 1 Nov. 242/2 This is evident from the familiar attempt to turn a grindstone or well-crank by pushing with all power in line against the shaft. 1986 U.S. Patent 4,873,635 7/1 A well crank arm..rotates at about 10 rpm and accordingly, each revolution of the crank requires approximately six seconds. < as lemmas |
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