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An instrument for measuring small differences in height, for example, between two columns of mercury.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an instrument for measuring a vertical distance between two points, which need not be situated along the same vertical. A cathetometer consists of a rod mounted vertically with the aid of a level and three leveling screws; a horizontally placed telescopic tube, which can be moved along the rod while remaining perpendicular to it; and a device for the accurate aiming of the tube. The eyepiece of the cathetometertube is equipped with crosshairs. In using a cathetometer thecrosshairs are successively aimed at each of the selected points, and the unknown distance is determined by the displacementshown on a scale on the cathetometer’s rod. The cathetometerwas invented by the French physicists P. Dulong and A. Petit(1816); various improvements in its construction were con-tributed by D. I. Mendeleev.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
With the help of a cathetometer, the contact angles of the taken aggregates wetting by bitumen binder samples were determined.
While these values for the standard deviations between each step are quite close, the standard deviation between time steps in consecutive runs at the lower temperatures were generally greater because it is more difficult to measure the passage of the meniscus with the cathetometer when the meniscus moves slowly.
Subsequently, the polymer surface was marked with a cathetometer followed by the addition of C[O.sub.2] to the desired pressure.
It was possible to measure the initial and final crack lengths adequately using an optical cathetometer positioned over an x-y micrometer table.
The climbing height of the fluid was then measured using a cathetometer (Gaertner Scientific Co.) with a reproducibility of 1 [[micro]meter].
After the dilatometer was filled with the reacting solution, a small volume of toluene was added in order to fill the capillary: then the dilatometer was put into a bath thermostated at 60 ([+ or -]0.1) [degrees] C and the decrease of the meniscus in the capillary was measured using a cathetometer. A magnetic stirrer guaranteed both thermal and composition homogeneity of the solution.