Fortin barometer
[ fawr-tan; French fawr-tan ]
/ ˈfɔr tæn; French fɔrˈtɛ̃ /
noun
an adjustable cistern barometer, the most common of those employing mercury.
Origin of Fortin barometer
1870–75; named after J.
Fortin (1750–1831), French physicist who invented it