| 释义 |
ascensional, a.|əˈsɛnʃənəl|
[f. prec. + -al1.]
1. Of or belonging to ascension. ascensional difference in Astr.: the difference between the right and oblique ascension of the sun or a star.
1594Blundevil Exerc. iii. i. xxxiv. 347 The ascentionall difference being knowne, all the oblique ascentions and descentions of the starres are easily knowne by the Tables of Directions. 1796Hutton Math. Dict. I. 148 The sun's Ascensional Difference, converted into time, shews how much he rises before or after 6 o'clock. 1834Nat. Philos. III. Hist. Astron. ii. 12/1 (U.K.S.) The ascensional difference (that is, the arc measuring the increase of the day at any place).
2. a. Of or belonging to ascent; tending upwards.
1753Chambers Cycl. Supp. App. s.v. Force, Huygens [held] that bodies constantly preserve their ascensional force, that is, the product of their mass by the height to which their center of gravity can ascend. 1860Tyndall Glac. i. §20. 137 The current, however, continued ascensional. 1880Colliery Guard. 5 Nov., The diffusion of gases in mines, and its relation to ascensional ventilation.
b. ascensional screw: a helical propeller that gives a lifting motion to an airship or flying-machine.
1901Westm. Gaz. 15 Aug. 6/1 With my ascensional screws..I am indifferent to wind, because I can rise and descend in search of a suitable belt of air. 1903Daily Chron. 27 Sept. 7/4 A new flying machine... It is the invention of Mr. H. A. Chubb, and it rises by means of ascensional screws or helices. |