Aneroid Barometer

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Aneroid Barometer
Áneroid´means ´containing no liquid´, and this form of barometer is so called bbecause it uses atmospheric pressure on a partial vacuum rather than on mercury. The invention goes back to Leibniz (1646-1716), but its first commercial use was by Lucien Vidie and his competitor, Eugéne Bourdon in the mid 1800´s. Desk or mantelpiece versions with visible workings were popular, and pocket types were also made in many sizes with gold, silver or brass cases. They should not be confused with anemometers or wind-gauges.