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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..

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

Barometrograph :: Barometrograph (n.) A form of barometer so constructed as to inscribe of itself upon paper a record of the variations of atmospheric pressure.

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

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, /..

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..

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..

#NAME? :: -meter () A suffix denoting that by which anything is measured; as, barometer, chronometer, dynamometer..

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.

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

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

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..

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..

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..

Barometrically :: Barometrically (adv.) By means of a barometer, or according to barometric observations..

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..

Barometer :: Barometer (n.) 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..

Self-registering :: Self-registering (a.) Registering itself; -- said of any instrument so contrived as to record its own indications of phenomena, whether continuously or at stated times, as at the maxima and minima of variations; as, a self-registering anemometer or barometer..

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

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..

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