单词 | sight tube |
释义 | > as lemmassight tube sight tube n. (a) a tube through which observations are made; (b) a transparent tube connected to a tank or cistern so as to display the level of the liquid inside it. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instruments for observing > [noun] sight tube1851 shufti-scope1948 the world > relative properties > measurement > measuring instrument > [noun] > for measuring level in a container dipstick1824 sight tube1851 dip-rod1923 1851 H. Melville Moby-Dick cxxiv. 571 The crushed copper sight-tubes of the quadrant. 1859 Times 7 Jan. 8/4 He can enter an enemy's harbour under water and make surveys, only showing above the surface a sight tube, no more than one half inch in diameter, and retire still under water. 1900 W. M. Stine Photometrical Measurements iii. 77 Adjust the telescopic sight tube until the different portions of the field are sharply outlined. 1905 Motor Manual (ed. 7) iv. 78 The oil..enters a series of sight tubes. 1951 Proc. Physical Soc. B. 64 49 The level of the liquid in the annular gap can be deduced from observations of its level in a vertical sight-tube attached to the filling apparatus. < as lemmas |
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