| 释义 |
sinical, a. Math.|ˈsɪnɪkəl|
Also 6 sinicall, 8 sinecal (?).
[f. sine2 + -ical.]
Of or relating to a sine or sines; employing or founded upon sines.
1593T. Fale Art of Dialling 60 This Table of Sines may seeme obscure and hard to them who are not acquainted with Sinicall computation. 1673Flamsteed in Rigaud Corr. Sci. Men (1841) II. 171 By this sinical projection..I can find the hour of the day to a minute. 1762Falconer Shipwr. i. 751 In chiliads next the analogy is sought: And on the sinical triangle wrought.
†b. sinical quadrant, a former nautical instrument having intersecting sines drawn from each side.
1669Sturmy Mariner's Mag. ii. i. 47 Instruments in esteem amongst Navigators..are chiefly..the Plain Scale, the Sinical Quadrant, the Plain Sea-Chard, and the True Sea-Chard. 1695W. Alingham Geom. Epit. 69 Several Mathematical Instruments, as sinical Quadrant, Forestaff [etc.]. 1701Moxon Math. Instr. 18 [Description given, copied by Harris, Kersey, etc.]. 1728Chambers Cycl. s.v. Quadrant. 1781 J. Adams (title), The Description and Use of a new much-improved Sinical Quadrant. 1788Trans. Soc. Arts VI. 185 The plain Triangle..[is] better than the sinecal Quadrant. |