from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An instrument using the atmospheric pressure as measured by the change in the boiling point of water to determine land elevations.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An instrument that measures altitude indirectly by measuring the boiling point of water (which varies with atmospheric pressure).
from the GNU version of the Collaborative International Dictionary of English
- n. An instrument for measuring heights by observation of barometric pressure; esp., one for determining heights by ascertaining the boiling point of water. It consists of a vessel for water, with a lamp for heating it, and an inclosed thermometer for showing the temperature of ebullition.
from The Century Dictionary and Cyclopedia
- n. A thermometrical barometer for measuring altitudes.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an altimeter that uses the boiling point of water to determine land elevation
Sleeping-bags, "computation bag," hypsometer, "meat block" (a three-inch-square paper pad on which meteorological notes were taken); clothes-bag opened, three ditty-bags passed in and bag retied; a final temperature taken and aneroid read; sledge anchored securely by tow-rope to the ice-axe, and a final look round to see all gear is safely strapped down and snow-tight.
The instruments we carried were a theodolite, a hypsometer, two aneroids, one of which was no larger than an ordinary watch, two thermometers, one chronometer watch, one ordinary watch, and one photographic camera (Kodak 3 x 3 inches), adapted for using either plates or films.
From the distance of the sea horizon we guessed our height to be about 1,000 feet, and in the evening the hypsometer showed the guess to be very nearly right.
The instruments we carried were two sextants and three artificial horizons -- two glass and one mercury -- a hypsometer for measuring heights, and one aneroid.
Besides the astronomical observations, the barometric pressure, temperature, force and direction of the wind, and amount of cloud were noted three times daily; every evening a hypsometer reading was taken.
The readings of the hypsometer gave practically the same result day after day; the ascent we were looking for failed to appear.
I took the observation for longitude and latitude, found the height by hypsometer, and took some photographs.
From 88º 25 'S. the barometer and hypsometer indicated slowly but surely that the plateau was beginning to descend towards the other side.
Other things we left there were a sextant with a glass horizon, a hypsometer case, three reindeer-skin foot-bags, some kamiks and mits.
The hypsometer showed 11,070 feet above the sea; we had therefore reached a greater altitude than the Butcher's.