| 单词 | nonius quadrant |
| 释义 | > as lemmasnonius quadrant A device consisting of a series of concentric arcs engraved on a quadrant, used for the accurate measurement of angles, altitudes, and heights. Also (in full nonius quadrant): the quadrant itself; also called pantometer. Frequently attributive. Now chiefly historical.The nonius was superseded by the vernier, with which it has sometimes been confused. ΘΚΠ the world > relative properties > number > mathematical instruments > [noun] > arithmetical instrument > sliding ruler slide rule1663 sliding rule1663 sliding gauge1683 sliding scale1706 logarithmical scales1728 nonius1732 1732 Philos. Trans. 1731–2 (Royal Soc.) 37 274 The Nonius Plate moves with the Index, and subdivides each of the small Divisions of the Arch into ten equal Parts or Minutes. 1752 Philos. Trans. 1749–50 (Royal Soc.) 46 515 In this Method another Observer will be generally necessary to note the Degree cut by the Nonius. 1781 M. Cutler Jrnl. 5 June in W. P. Cutler & J. P. Cutler Life, Jrnls. & Corr. M. Cutler (1888) I. 86 I went to Salem to get a nonius fitted to my barometer. 1804 Philos. Trans. (Royal Soc.) 94 78 Their scales were divided with the greatest care; and, by means of a nonius, they show eighth parts of a degree very distinctly. 1837 D. Brewster Treat. Magnetism 350 The lever or clamp, connected with the nonius screw on one of the deflectors. 1881 A. de S. Pinto How I crossed Afr. II. ii. ii. 160 I read in the nonius 50° 10′. 1943 Empire Survey Rev. July 102 Graham undertook to make a zenith sector.., and in this instrument the vernier or nonius was abandoned in favour of a micrometer screw. 1990 A. Chapman Dividing Circle ii. 22 [Clavius and Curtis] attempted to simplify the Nonius quadrant both by reducing the number of concentric arcs required to read an angle, and by dividing them up into sequences of equal parts that could be arrived at by continuous bisection. < as lemmas |
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