| 单词 | triangular quadrant |
| 释义 | > as lemmastriangular quadrant a. Pertaining or relating to a triangle: as triangular compasses, a kind of compasses with three legs, used for taking off triangles; triangular co-ordinates (Geometry), a kind of trilinear co-ordinates. triangular quadrant: see quot. 1706. 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 1701 T. Tuttell Descr. Math. Instruments in J. Moxon Math. made Easie (ed. 3) 21 Triangular Compasses, containing 3 Legs or Feet, to take off at once any Triangle used on Maps, Globes, etc. 1706 Phillips's New World of Words (new ed.) Triangular Quadrant, is a Sector with a loose Piece to make it an Equilateral Triangle; having the Calendar graduated on it, with the Sun's Place, Declination, &c. It is an Instrument of great Use in the Arts of Dialling, Navigation, and Surveying. 1807 T. Young Course Lect. Nat. Philos. I. x. 102 Triangular compasses are sometimes used for laying down a triangle equal to a given triangle. < as lemmas |
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