| 单词 | danger angle |
| 释义 | > as lemmasdanger angle danger angle n. (a) Nautical the angle enclosed by lines drawn from two known points to a point marking the limit of safe approach to a danger to navigation, so that a ship by steering a course keeping the two known points at a larger or smaller angle will avoid the danger; (b) Gunnery (see quot. 1918). ΚΠ 1892 Notes on Navigation H.M. Ships (ed. 3) 13 The use of a danger angle in passing outlying rocks with land behind should also not be forgotten. 1902 Encycl. Brit. XXXI. 109/2 To avoid an unnecessarily wide détour in rounding points and shoals, extensive use is now made of both horizontal and vertical danger angles. 1902 Encycl. Brit. XXXI. 109/2 The vertical danger angle enables similar results to be attained by measuring the vertical angle subtended by a known height. 1918 E. S. Farrow Dict. Mil. Terms Danger angle, the angle which the tangent to the trajectory at the point of splash makes with the plane containing the point of splash and parallel to the horizontal plane through the muzzle of the piece in the firing position. < as lemmas |
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