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  • Webster's Revised Unabridged Dictionary
    • n Cathetometer 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.
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Century Dictionary and Cyclopedia
    • n cathetometer An instrument for measuring small differences of level between two near points, as, for example, the distance between the levels of the mercury in the cistern and in the tube of a barometer. It consists essentially of a vertical graduatedrod carefully leveled, upon which slides a horizontal telescope. With the telescope the observer sights in succession the two objects under examination, and the distance on the graduated rod traversed by the telescope is the measure of the difference of height between the two objects. As constructed for the physicist, with numerous arrangements to insure accuracy, the cathetometer is an instrument of a high degree of accuracy.
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Chambers's Twentieth Century Dictionary
    • Cathetometer an instrument for measuring small differences of level of different liquids in tubes
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Webster's Revised Unabridged Dictionary
From Gr. vertical height + -meter,
Chambers's Twentieth Century Dictionary
Gr. kathetos, perpendicular, kathet─ôr, from kathienai, to send down.


In literature:

Among the instruments used for the adjustment of the parts of the main machine we saw the finest cathetometer we had ever seen.
"Scientific American, Vol. XLIII.--No. 1. [New Series.], July 3, 1880" by Various