Cathetometer

Cath`e*tom"e*ter

(?), n. [From Gr. vertical height + -meter.] An instrument for the accurate measurement of small differences of height; esp. of the differences in the height of the upper surfaces of two columns of mercury or other fluid, or of the same column at different times. It consists of a telescopic leveling apparatus (d), which slides up or down a perpendicular metallic standard very finely graduated (bb). The telescope is raised or depressed in order to sight the objects or surfaces, and the differences in vertical height are thus shown on the graduated standard.
[Written also kathetometer.]

[1913 Webster]

Cath"e*tus

(?), n.;
pl. catheti (#).
[L., fr. Gr. a perpendicular line, fr. let down, fr. . See Catheter.] (Geom.) One line or radius falling perpendicularly on another; as, the catheti of a right-angled triangle, that is, the two sides that include the right angle. Barlow.
[1913 Webster]

 

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Sat 15th December 2018