aneroid barometer

3 definitions found

aneroid barometer - Collaborative International Dictionary of English v.0.48 :

  Aneroid \An"e*roid\, a. [Gr. 'a priv. + nhro`s wet, moist +
     -oid: cf. F. an['e]ro["i]de.]
     Containing no liquid; -- said of a kind of barometer.
     [1913 Webster]
  
     Aneroid barometer, a barometer the action of which depends
        on the varying pressure of the atmosphere upon the elastic
        top of a metallic box (shaped like a watch) from which the
        air has been exhausted. An index shows the variation of
        pressure.
        [1913 Webster]

  Barometer \Ba*rom"e*ter\, n. [Gr. ba`ros weight + -meter: cf. F.
     barom[`e]tre.]
     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.
     [1913 Webster]
  
     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. --Nichol.
           [1913 Webster]
  
     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.
        [1913 Webster] Barometric

aneroid barometer - WordNet (r) 2.1 (2005) :

  aneroid barometer
      n 1: a barometer that measures pressure without using fluids
           [syn: aneroid barometer, aneroid]