Source : Webster's Revised Unabridged Dictionary (1913)

Barometer \Ba*rom"e*ter\, n. [Gr. ? 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.

   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.

   {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.

Marine \Ma*rine"\, a. [L. marinus, fr. mare the sea: cf. F.
   marin. See {Mere} a pool.]
   1. Of or pertaining to the sea; having to do with the ocean,
      or with navigation or naval affairs; nautical; as, marine
      productions or bodies; marine shells; a marine engine.

   2. (Geol.) Formed by the action of the currents or waves of
      the sea; as, marine deposits.

   {Marine acid} (Chem.), hydrochloric acid. [Obs.]

   {Marine barometer}. See under {Barometer}.

   {Marine corps}, a corps formed of the officers,
      noncommissioned officers, privates, and musicants of
      marines.