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Weatherglass :: Weatherglass (n.) An instrument to indicate the state of the atmosphere, especially changes of atmospheric pressure, and hence changes of weather, as a barometer or baroscope..

Symplectic :: Sympiesometer (n.) A sensitive kind of barometer, in which the pressure of the atmosphere, acting upon a liquid, as oil, in the lower portion of the instrument, compresses an elastic gas in the upper part..

Mercurial :: Mercurial (a.) Of or pertaining to, or containing, mercury; as, mercurial preparations, barometer. See Mercury, 2..

Aneroid :: Aneroid (a.) Containing no liquid; -- said of a kind of barometer.

Mercury :: Mercury (n.) A metallic element mostly obtained by reduction from cinnabar, one of its ores. It is a heavy, opaque, glistening liquid (commonly called quicksilver), and is used in barometers, thermometers, ect. Specific gravity 13.6. Symbol Hg (Hydrargyrum). Atomic weight 199.8. Mercury has a molecule which consists of only one atom. It was named by the alchemists after the god Mercury, and designated by his symbol, /..

Vernier :: Vernier (n.) A short scale made to slide along the divisions of a graduated instrument, as the limb of a sextant, or the scale of a barometer, for indicating parts of divisions. It is so graduated that a certain convenient number of its divisions are just equal to a certain number, either one less or one more, of the divisions of the instrument, so that parts of a division are determined by observing what line on the vernier coincides with a line on the instrument..

Aneroid :: Aneroid (n.) An aneroid barometer.

Reading :: Reading (n.) An observation read from the scale of a graduated instrument; as, the reading of a barometer..

Isobar :: Isobar (n.) A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line..

Meteorometer :: Meteorometer (n.) An apparatus which transmits automatically to a central station atmospheric changes as marked by the anemometer, barometer, thermometer, etc..

Fall :: Fall (v. t.) To Descend, either suddenly or gradually; particularly, to descend by the force of gravity; to drop; to sink; as, the apple falls; the tide falls; the mercury falls in the barometer..

Gimbals :: Gimbals (n.) A contrivance for permitting a body to incline freely in all directions, or for suspending anything, as a barometer, ship's compass, chronometer, etc., so that it will remain plumb, or level, when its support is tipped, as by the rolling of a ship. It consists of a ring in which the body can turn on an axis through a diameter of the ring, while the ring itself is so pivoted to its support that it can turn about a diameter at right angles to the first..

Holosteric :: Holosteric (a.) Wholly solid; -- said of a barometer constructed of solid materials to show the variations of atmospheric pressure without the use of liquids, as the aneroid..

Baric :: Baric (a.) Of or pertaining to weight, esp. to the weight or pressure of the atmosphere as measured by the barometer..

Hydrobarometer :: Hydrobarometer (n.) An instrument for determining the depth of the sea water by its pressure.

Atmo :: Atmo (n.) The standard atmospheric pressure used in certain physical measurements calculations; conventionally, that pressure under which the barometer stands at 760 millimeters, at a temperature of 0� Centigrade, at the level of the sea, and in the latitude of Paris..

Barometrical :: Barometrical (a.) Pertaining to the barometer; made or indicated by a barometer; as, barometric changes; barometrical observations..

Torricellian :: Torricellian (a.) Of or pertaining to Torricelli, an Italian philosopher and mathematician, who, in 1643, discovered that the rise of a liquid in a tube, as in the barometer, is due to atmospheric pressure. See Barometer..

Water Barometer :: Water barometer () A barometer in which the changes of atmospheric pressure are indicated by the motion of a column of water instead of mercury. It requires a column of water about thirty-three feet in height.

Thermobarometer :: Thermobarometer (n.) An instrument for determining altitudes by the boiling point of water.

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