| 单词 | perpetual screw |
| 释义 | > as lemmasperpetual screw ΘΚΠ society > occupation and work > equipment > machine > parts of machines > wheel > [noun] > cog or gear > with endless screw > endless screw endless screw?1575 perpetual screw1648 worm1730 1648 Bp. J. Wilkins Math. Magick i. ix Another invention, commonly styled a perpetuall screw, which hath the motion of a wheel and the force of a screw, being both infinite. 1773 W. Emerson Princ. Mech. (ed. 3) 42 The endless or perpetual screw AB, having one worm, leaf, or tooth, which drives the teeth of the wheel CD. 1897 Times 23 Sept. 26/4 The engineering device called ‘the perpetual screw’ exactly typified the Education Department. < as lemmas |
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