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On Wed, 05 Jun 2002 11:04:26 -0700 Bernard Cleyet <anngeorg@PACBELL.NET>
writes:
Why do they call it a "mercury" barometer?http://www.islandnet.com/~see/weather/history/barometerhistory1.htm
as aposed to the original Torricelli barometer? (water)
Until the advent of S.S. electronics, neroid barometers were
significantly more efficient (cost per performance) than the
mechanical ones (aneroid).
*** Please explain what you mean by the above sentence.
Geologists use(d) aneroids for mapping. Their
resolution is ~ one foot. (memory) The pilot on this list can
compare this to his. [What does he use now?]
*** Pilots are more likely to use either altimeters, which are
specially calibrated aneroid barometers, or radar devices.
Herb Gottlieb from New York City
(Where we have found ingenious ways to measure the heights of our
buildings with mercury barometers)