| 单词 | proportional compass |
| 释义 | > as lemmasproportional compass proportional compass n. †(a) = paradoxal compass n. at paradoxal adj. 1 (obsolete); (b) chiefly historical a compass having two opposite pairs of legs turning on a common pivot, the position of which is adjustable, so that the distances between the pairs of points on either side of the pivot may be set to any desired ratio (cf. reducing compass n. at reducing n. Compounds 2, reduction compass n. at reduction n. Compounds 2); (also) a sector (sector n. 3). ΘΚΠ the world > relative properties > measurement > measuring instrument > [noun] > for measuring distances > compasses, dividers, or callipers compassa1387 proportional compass1570 callipers1571 calliper compass1581 triangular compasses1701 dividers1703 cannipers1707 hair-compasses1728 bow-compass1796 outside calliper1874 wing-compass1875 moff1885 odd-leg1900 1570 J. Dee in H. Billingsley tr. Euclid Elements Geom. Math. Præf. sig. diiijv The Proportionall, and Paradoxall Compasses (of me Inuented). 1728 E. Chambers Cycl. at Reduction The grand use of the proportional Compasses is in the Reduction of Figures, &c. whence they are also called Compasses of Reduction. 1807 T. Young Course Lect. Nat. Philos. I. x. 103 Proportional compasses are..of great use in reducing lines and figures to a different scale. 1965 Technol. & Culture 6 242 Another instrument described and illustrated by Bion, the compas de proportion (sector, or sometimes proportional compass), owes its origin to..Galileo Galilei. 1986 Design Issues 3 59/1 Beam and telescopic compasses came into use, as did..complex dividers, proportional compasses, and innumerable forms of rulers. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。