barometer : Idioms & Phrases

• noun a barometer that measures pressure without using fluids
  aneroid.
  

WordNet

• . See Aneroid barometer, under Aneroid.
• 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.

Webster 1913

• 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.

Webster 1913

• noun barometer that shows pressure by the height of a column of mercury
  

WordNet

• a portable barometer, adapted for safe transportation, used in measuring the heights of mountains.
• a portable mercurial barometer with tripod support, and long scale, for measuring heights.

Webster 1913

• 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.

Webster 1913

Wa"ter ba*rom"e*ter

Definitions

1. (Physics) A barometer in which the changes of atmospheric pressure are indicated by the motion of a column of water instead of mercury. It requires a column of water about thirty-three feet in height.

Webster 1913

• a barometer with recurved tube, and a float, from which a cord passes over a pulley and moves an index.

Webster 1913