Definition of Baromiter
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.
Nichol.
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
index.
- Webster's Unabridged Dictionary (1913)
BAROMETER, n. An ingenious instrument which indicates what kind of
weather we are having.
- 1811 Dictionary of the Vulgar Tongue
- (meteorology) An instrument for measuring atmospheric pressure
- The Nuttall Encyclopedia
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