Learn about Barometer

The barometer is an instrument for measuring atmospheric pressure. The pressure indicated can aid in predicting short term weather.

There are two main types of barometer in use, the mercury barometer, which can either be in the form of a "stick" or a "wheel", and the aneroid barometer, a later invention and most commonly available.

Italian Evangelista Torricelli, an associate of Galileo, is generally credited with inventing the mercury barometer in 1643. Galileo suggested to Evangelista Torricelli that he use mercury in his vacuum experiments.

A mercury barometer has a glass tube with a height of at least 84 cm, closed at one end, with an open mercury-filled reservoir at the base. The weight of the mercury creates a vacuum in the top of the tube. Mercury in the tube adjusts until the weight of the mercury column balances the atmospheric force exerted on the reservoir. more...
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A General Fitzroy barometer, including storm glass and thermometer, height: 102 cm

An Admiral Fitzroy original barometer. 92 cm long, 21 cm wide

A rare Admiral Fitzroy mercury barometer in an oak cabinet c.1880 125 cm high

An Admiral Fitzroy patent barometer in walnut case; by Comitti. Height 110 cm

A mahogany early 19th century 'admiral Fitzroy' style barometer.

Australian late 19th century 'Admiral Fitzroy' barometer in cedar case, adapted to the southern hemisphere. RLJ Ellery Esquire and retailed by Thomas Gaunt, Melbourne. Length 107 cm

An Admiral Fitzroy mid 19th century oak barometer. The barometer and thermometer on a lithograph printed paper dial. Provenance: Tradition has it that the barometer is Admiral Fitzroy's barometer taken on expedition voyages with Darwin and given by Fitzroy

A 19th century Admiral Fitzroy's barometer, oak cased the interior case with Admiral Fitzroy remarks on atmospheric changes and printed Gothic decoration. Height 107.5 cm. Width 22.5 cm