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Barometer   /bərˈɑmɪtər/   Listen
noun
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. Note: 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.
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.






Collaborative International Dictionary of English 0.48








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"Barometer" Quotes from Famous Books



... of the town is a man of varied attainments, being also a photographer, watch-maker, medical-adviser, chemist, and so forth. His house is full of scientific instruments—a really good camera, a fine aneroid barometer, several thermometers, including self-registering maximum and minimum, etc., etc. All seem excellent in quality, but I could not learn that he makes any use of them, except the camera. The cura, and the judge deride his possession of the instruments, ...
— In Indian Mexico (1908) • Frederick Starr

... hundred miles south of the Mauritius, in fine weather with a light breeze, Dodd's marine barometer began to fall steadily; and by the afternoon the declension had become so remarkable, that he felt uneasy, and, somewhat to the surprise of the crew,—for there was now scarce a breath of air,—furled his slight sails, ...
— Hard Cash • Charles Reade

... the use of instruments, and can take observations of the temperature of hot springs, if any are found. HALL knows nothing about instruments, and could not tell the time by a barometer if his life depended upon it. Therefore HAYES should ...
— Punchinello, Vol. 1, No. 6, May 7, 1870 • Various

... Tides, Refraction of Lens, including thickness, &c., Ivory's paper on Equations, Achromatism of microscope, Capillary Attraction, Motions of Fluids, Euler's principal axes, Spherical pendulum, Equation b squared(d squaredy/dx squared)(d squaredy/dt squared), barometer, Lunar Theory well worked out, ordinary differential equations, Calculus of Variations, Interpolations like Laplace's for Comets, Kepler's theorem. In September I had my old telescope mounted on a short tripod stand, and made ...
— Autobiography of Sir George Biddell Airy • George Biddell Airy

... the rise in authority of the Emperor who was the mob's exponent. Increase of arbitrary power went with the growing weakness of the Romans themselves. Always the "Emperor" serves as a sort of historical barometer by which to measure the abasement of the people. The concentrated power of Julius Caesar, resting on his own tremendous personality, showed that the days of Cincinnatus and of Junius Brutus were past. The strength ...
— Popular Science Monthly Volume 86


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