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.

(Bar`o*met"ric) Barometrical
(Bar`o*met"ric*al) a. Pertaining to the barometer; made or indicated by a barometer; as, barometric changes; barometrical observations.

(Bar`o*met"ric*al*ly), adv. By means of a barometer, or according to barometric observations.

(Bar`o*met"ro*graph) n. baros weight + me`tron measure + -graph.]—> A form of barometer so constructed as to inscribe of itself upon paper a record of the variations of atmospheric pressure.

(Ba*rom"e*try) n. The art or process of making barometrical measurements.

(Bar"o*metz) n. [Cf. Russ. baranets' clubmoss.] (Bot.) The woolly-skinned rhizoma or rootstock of a fern which, when specially prepared and inverted, somewhat resembles a lamb; — called also Scythian lamb.

(Bar"on) n. [OE. baron, barun, OF. baron, accus. of ber, F. baron, prob. fr. OHG. baro (not found) bearer, akin to E. bear to support; cf. O. Frisian bere, LL. baro, It. barone, Sp. varon. From the meaning bearer (of burdens) seem to have come the senses strong man, man which is the oldest meaning in French, and lastly, nobleman. Cf. L. baro, simpleton. See Bear to support.]

1. A title or degree of nobility; originally, the possessor of a fief, who had feudal tenants under him; in modern times, in France and Germany, a nobleman next in rank below a count; in England, a nobleman of the lowest grade in the House of Lords, being next below a viscount.

"The tenants in chief from the Crown, who held lands of the annual value of four hundred pounds, were styled Barons; and it is to them, and not to the members of the lowest grade of the nobility (to whom the title at the present time belongs), that reference is made when we read of the Barons of the early

(Bar"o*graph) n. [Gr. ba`ros weight + -graph.] (Meteor.) An instrument for recording automatically the variations of atmospheric pressure.

(Ba*ro"ko) n. [A mnemonic word.] (Logic) A form or mode of syllogism of which the first proposition is a universal affirmative, and the other two are particular negatives.

(Ba*rol"o*gy) n. [Gr. baros weight + -logy.] The science of weight or gravity.

(Bar`o*ma*crom"e*ter) n. [Gr. baros weight + makro`s long + -meter.] (Med.) An instrument for ascertaining the weight and length of a newborn infant.

(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.

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 See Sympiesometer. Nichol.

  By PanEris using Melati.

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