barograph

[bar-uh-graf, -grahf]
noun
any of several automatic recording barometers, of which the most common is the aneroid barograph.

Origin:
1860–65; baro- + -graph

barographic [bar-uh-graf-ik] , adjective
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World English Dictionary
barograph (ˈbærəˌɡrɑːf, -ˌɡræf)
 
n
meteorol a self-recording aneroid barometer
 
barographic
 
adj

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American Heritage
Science Dictionary
barograph   (bār'ə-grāf')  Pronunciation Key 
An instrument that continuously records changes in atmospheric pressure. A barograph typically consists of an aneroid barometer connected to a pen; the pen is in contact with a piece of paper mounted on a cylinder that rotates once on a daily or weekly basis. As the atmospheric pressure changes, the pen is displaced in proportion to the change, thus a record of the pressure is traced onto the rotating sheet of paper.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They listed as unusual the double minimum of some barograph traces and the
  abrupt onset of high winds.
The barograph will be adjusted and corrected to correspond with the corrected
  air pressure thus obtained.
These readings confirm the low pressure shown by barograph and indicate the
  great intensity of the hurricane.
There is a new barograph but this instrument cannot be used as its
  specifications do not fall within the station height level.
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