barograph

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barograph, instrument used to make a continuous recording of atmospheric pressure. The pressure-sensitive element, a partially evacuated metal cylinder, is linked to a pen arm in such a way that the vertical displacement of the pen is proportional to the changes in the atmospheric pressure. The pen traces a record of pressure versus time on a chart, which is mounted on a drum rotated by a clockwork. Each chart usually provides one week's record. See barometer.

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barograph A barometer that gives a continuous recording of air pressure. It is based on an aneroid instrument with levers attached to the vacuum chambers, and records a trace on a chart mounted around a clock drum.

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barograph Barometer that gives a continuous recording of air pressure. It is based on an aneroid instrument with levers attached to the vacuum chambers, and records a trace on a chart mounted around a clock drum.

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bar·o·graph / ˈbarəˌgraf/ • n. a barometer that records its readings on a moving chart.