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Fortin barometer

[fawr-tan; French fawr-tan]
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noun
  1. an adjustable cistern barometer, the most common of those employing mercury.
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Origin of Fortin barometer

1870–75; named after J. Fortin (1750–1831), French physicist who invented it
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018