Cistern barometer: Difference between revisions
From Glossary of Meteorology
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Latest revision as of 16:40, 26 January 2012
cistern barometer[edit | edit source]
A mercury barometer in which the lower mercury surface is larger in area than the upper surface.
The basic construction of a cistern barometer is as follows: A glass tube 1 m in length, sealed at one end, is filled with mercury, and then inverted. The tube is mounted so that its mouth penetrates the upper surface of a reservoir of mercury called the cistern of the barometer. Cistern barometers are classified according to whether the cistern is fixed in volume (
see Kew barometer) or variable in volume (
see Fortin barometer).
see Kew barometer) or variable in volume (
see Fortin barometer).