| 单词 |
hydro-pneumatic |
| 释义 |
hydro-pneumatic, a. (n.)|ˌhaɪdrəʊnjuːˈmætɪk|
[f. hydro- a + pneumatic: in F. hydro-pneumatique.]
Pertaining to water and air or gas; applied to apparatus involving the combined action of water and air.
Originally applied to the method of collecting and retaining gas over water in the pneumatic trough, invented by Cavendish about 1765.
1794Pearson in Phil. Trans. LXXXIV. 399 In close vessels, with the hydro-pneumatic apparatus affixed. 1812Sir H. Davy Chem. Philos. 35 Mr. Cavendish, about 1765, invented an apparatus for examining elastic fluids confined by water, which has been since called the hydro-pneumatic apparatus. 1815W. Congreve (title) A Description of the Construction and Properties of the Hydro-Pneumatic Lock. 1816J. Tilley in Philos. Mag. XLIII. 280 Description of a Hydro-Pneumatic Blow-pipe for the use of Chemists [etc.]. 1851Illustr. Catal. Gt. Exhib. 222 New hydro-pneumatic engine. The..water pressure to drive the piston..in one direction, and a vacuum being produced, to make..atmospheric pressure to drive it in an opposite direction. Ibid. 311 Hydro-pneumatic lift, for canal locks. Hydro-pneumatic elevators. 1884Mil. Engineering (ed. 3) I. ii. 40 Guns mounted on hydro-pneumatic (disappearing) carriages.
B. n. pl. Hydro-pneumatic appliances.
1887Pall Mall G. 27 Dec. 11/2 The application of hydro-pneumatics in substitution for counterweights was protected by letters patent, granted to Col. Moncrieff in 1869. |
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