| 单词 | ball trap |
| 释义 | > as lemmasball trap ball trap n. a valve or trap (trap n.1 8) in which a floating ball directly closes an opening, either by its weight, as the water level falls, or by its buoyancy, as the level rises. ΘΚΠ the world > physical sensation > cleanness and dirtiness > sanitation > provision of sewers > [noun] > sewer > trap > types of well trap1819 bell-trap1867 ball trap1873 siphon trapa1884 pot trap1884 1873 E. A. Parkes Man. Pract. Hygiene (ed. 4) 344 The ball-trap is used in some special cases only; a ball is lifted up as the water rises, until it impinges on and closes an orifice. 1914 V. Havard Man. Mil. Hygiene (ed. 2) xlvi. 548 In the ball-trap, which is one of several obsolete mechanical types, the water displaced a ball which, by its weight, falls back upon the outlet. 1997 A. Barber Pneumatic Handbk. (ed. 8) iv. 232 Where there is the possibility of a large quantity of water to be discharged from a ball trap, an air lock may occur. < as lemmas |
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