from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An instrument used to measure small vertical distances
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. 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.
Sorry, no etymologies found.
In spite of a couple of careful experiments with the cathetometer I have not succeeded in measuring the vacuum in the vacuum bulb, but judge from indications, that is about as high as that obtained in an ordinary
All the measurements were made by a fine cathetometer which was constructed for me by William Grunow; see this Journal, Jan.,
This seemingly awkward proceeding has in no case been attended with the slightest accident, and owing to the presence of the four leveling-screws, the pump when righted returns, as shown by the telescope of the cathetometer, almost exactly to its original place.
The length of the inclosed cylinder of air is then measured with the cathetometer, also the height of the mercurial
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