Fortin-type mercury barometer

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• Barometer — Schematic drawing of a simple mercury barometer with vertical mercury column and reservoir at base …   Wikipedia

• Fortin's barometer — /fɔtənz bəˈrɒmətə/ (say fawtuhnz buh romuhtuh) noun a type of mercury barometer for making accurate readings of the pressure of the atmosphere; contains an adjustable mercury cistern. {named after J Fortin, 1750–1831, French physicist} …