| 释义 |
Abney|ˈæbnɪ|
The surname of Sir William de Wiveleslie Abney (1844–1920) in Abney level (level n. 1), a small hand instrument used by surveyors for measuring slopes and angles above the horizon. Also Abney clinometer.
1889G. W. Usill Pract. Surveying iii. 33 The Abney Level.—This portable and neat little instrument is a reflecting level and clinometer combined... It was invented by Captain Abney (of photographic renown). 1946R. J. C. Atkinson Field Archaeol. ii. iii. 136 Abney Clinometer..The instrument consists of a sighting tube fitted with a pin-hole aperture, [etc.]. 1955Oxf. Jun. Encycl. VIII. 429/1 The Abney level or clinometer, which consists of a sighting tube fixed to a semicircular vertical plate marked in degrees, with a spirit level attached to its index, is..used to measure vertical angles. |