| 单词 | proportional circle |
| 释义 | > as lemmasproportional circle ΘΚΠ society > occupation and work > equipment > machine > parts of machines > wheel > [noun] > parts of wheels > tooth > imaginary line through pitch line1787 pitch circle1813 proportional circle1825 1825 ‘J. Nicholson’ Operative Mechanic 21 When these two circles [representing wheel and pinion] are so placed that their outer rims shall touch each other, a line drawn from the centre of the one to the centre of the other is termed the line of centres... These circles are sometimes called proportional circles, but by mill-wrights in general pitch lines. < as lemmas |
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