| 单词 | fall tube |
| 释义 | > as lemmasfall tube fall tube n. (a) a tube in a mercury air pump through which drops of mercury fall, driving air forward and thus creating a vacuum in the vessel at the top of the tube (now historical); †(b) the supply pipe of a water motor (obsolete). ΚΠ 1865 H. Sprengel in Jrnl. Chem. Soc. 18 12 By means of the tube z y x, it is connected with the tube c d, which I call the ‘fall tube’. 1891 Electrician 2 Oct. 608/1 A part of the Falls of Tivoli is conducted along an aqueduct, at the extremity of which the water falls into a large iron fall-tube, 1.6 of a metre in diameter. 1894 Westm. Gaz. 1 May 7/2 The fall tube is about two metres in diameter. 1904 G. F. Goodchild & C. F. Tweney Technol. & Sci. Dict. 9/1 Mercury is poured into a large funnel (A), and flows through the tubes AB and BC into the ‘pump head’ D, from which it falls down the ‘fall tube’ DE, whose length is greater than the height of the barometer. 2005 Jrnl. Vacuum Sci. & Technol. A. 23 1253/2 Both the Geissler–Töpler pump and the Sprengel pump (with one fall tube) were extremely slow. < as lemmas |
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