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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..

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, /..

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..

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..

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

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

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

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

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..

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

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

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..

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

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..

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.

Glass :: Glass (v. t.) A weatherglass; a barometer.

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

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

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..

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..

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