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Barometers > Barometer Styles • Barometers at eBay • Barograph Photo

 
antique barograph in a wood and glass case
Barographs record the atmospheric pressure over the course of time.  A traditional barograph, such as this one, contains an aneroid barometer and uses a pen to produce a paper chart, called a barogram.  The cylindrical drum, on which the paper chart is mounted, revolves once each day, week, or month.  Today, modern electronic weather instruments have largely replaced mechanical barographs in meteorological applications.
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Barograph Picture