Kew barometer

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A barometer in which the scale markings are adjusted to take account of the changes of the mercury level in the cistern, so eliminating the need to adjust the cistern to the fiducial point, as is required in the Fortin barometer. Kew barometers are often used at sea, because they can be made to minimize the oscillations in the height of the mercury caused by movements of the ship, and they can be transported horizontally or inverted, with the cistern at the top and the tube filled with mercury.

Subjects: Ecology and Conservation.

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