- (meteorology) An instrument for measuring atmospheric pressure
- The Nuttall Encyclopedia
BAROMETER, n. An ingenious instrument which indicates what kind of
weather we are having.
- 1811 Dictionary of the Vulgar Tongue
Ba*rom"e*ter (&?;), n. [Gr. baros
weight + -meter: cf. F. baromètre.] An instrument
for determining the weight or pressure of the atmosphere, and hence for
judging of the probable changes of weather, or for ascertaining the height
of any ascent.
&fist; The barometer was invented by Torricelli at Florence about 1643.
It is made in its simplest form by filling a graduated glass tube about 34
inches long with mercury and inverting it in a cup containing mercury. The
column of mercury in the tube descends until balanced by the weight of the
atmosphere, and its rise or fall under varying conditions is a measure of
the change in the atmospheric pressure. At the sea level its ordinary
height is about 30 inches (760 millimeters). See Sympiesometer.
Aneroid barometer. See Aneroid barometer,
under Aneroid. -- Marine barometer, a
barometer with tube contracted at bottom to prevent rapid oscillations of
the mercury, and suspended in gimbals from an arm or support on
shipboard. -- Mountain barometer, a portable
mercurial barometer with tripod support, and long scale, for measuring
heights. -- Siphon barometer, a barometer having
a tube bent like a hook with the longer leg closed at the top. The height
of the mercury in the longer leg shows the pressure of the atmosphere.
-- Wheel barometer, a barometer with recurved tube,
and a float, from which a cord passes over a pulley and moves an
- Webster's Unabridged Dictionary (1913)
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