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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



... man of penetration and soon realized the state of the social barometer. His hosts, who did not look at all like quiet boys, were eating their blackfish in perfect silence, save for polite requests for bread or pepper, or the occasional courteous remark, "Chuck ...
— A Little Bush Maid • Mary Grant Bruce

... that the measurements are independent of the actual height of the barometer, and if several readings are taken continuously, the result will not be sensibly affected by a simultaneous change of the barometer. Almost all the readings were taken at a temperature of about 20 deg. C., and in the ...
— Scientific American Supplement, No. 303 - October 22, 1881 • Various

... mists of morning had cleared away from the lofty hills to the north-east of our encampment I had commenced their ascent with a party of three men. To my great vexation, on taking out the barometer at the bottom of the hill, it was broken, and I could therefore no longer hope to be able to obtain the height of remarkable elevations. I managed to ride the pony up the hill for some time, but the broken and rocky nature of the ground obliged me at last to ...
— Journals Of Two Expeditions Of Discovery In North-West And Western Australia, Vol. 1 (of 2) • George Grey

... The barometer of Adam's friendliness dropped another degree. "That affair was finally settled at five thousand," he said, and this time he ...
— Helen of the Old House • Harold Bell Wright

... riffles and shallows and thus deny passage under the ice to the water of fountains and springs that never ceases flowing. So it bursts forth and flows over the ice with a continually renewing surface of the smoothest texture. Carrying a mercurial barometer that one dare not intrust to a sled on one's back over such footing is a somewhat precarious proceeding, but there was no alternative, and many miles were thus passed. Up the Toklat, then up its Clearwater Fork, then up its tributary, Myrtle Creek, to its head, and so ...
— The Ascent of Denali (Mount McKinley) - A Narrative of the First Complete Ascent of the Highest - Peak in North America • Hudson Stuck


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