cathetometern.
/kaθɪˈtɒmɪtə/ An instrument for measuring vertical distances, esp. small differences of level of liquid columns in tubes.
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the world > relative properties > measurement > measuring instrument > [noun] > for measuring level in a container > for measuring minute difference in level
cathetometer1849
1849 R. V. Dixon Treat. Heat i. 52 An instrument, since called a kathetometer..used in physical investigations for the purpose of measuring small differences of vertical heights.
1864 in Webster's Amer. Dict. Eng. Lang.
1871 B. Stewart Heat (ed. 2) §63 The difference of level between the surface of mercury in the two tubes was read by means of a cathetometer.
1879 W. Thomson & P. G. Tait Treat. Nat. Philos. (new ed.) I: Pt. i. §429 The Cathetometer is used for the accurate determination of differences of level.
This entry has not yet been fully updated (first published 1889; most recently modified version published online December 2020).
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n.1849