aneroid barometer

American  

noun

1. a device for measuring atmospheric pressure, often specially calibrated for use as an altimeter, consisting of a box or chamber partially exhausted of air, having an elastic top and a pointer to indicate the degree of compression of the top caused by the external air.

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aneroid barometer British  

noun

1. a device for measuring atmospheric pressure without the use of fluids. It consists of a partially evacuated metal chamber, the thin corrugated lid of which is displaced by variations in the external air pressure. This displacement is magnified by levers and made to operate a pointer

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aneroid barometer Scientific  

/ ăn′ə-roid′ /

1. A barometer consisting of a thin elastic disk covering a chamber that contains a partial vacuum. High atmospheric pressure pushes against the disk and causes it to bulge inward, while low pressure does not push as hard, allowing the disk to bulge outward. An aneroid barometer is smaller and more portable than a mercury barometer and, when used with a barograph, can record up to a week's worth of data. Aneroid barometers are used extensively in aviation as part of altimeters.

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Etymology

Origin of aneroid barometer

First recorded in 1840–50

Example Sentences

Trekking to a mountain top, he used an aneroid barometer to help him calculate its height.

From BBC • Nov. 13, 2013

Got a little doodad out of his pocket; aneroid barometer, or something, he said it was.

From The Brain by Blade, Alexander

Muir's aneroid barometer showed a height of about seven thousand feet, and the wall of rock towered threateningly above us, leaning out in places, a thousand feet or so above the glacier.

From Alaska Days with John Muir by Young, Samual Hall

Barograph, a kind of aneroid barometer, which, by means of special mechanism and appliances, is made to furnish automatically a continuous record of the successive changes in atmospheric pressure.

From The New Gresham Encyclopedia. Vol. 1 Part 3 Atrebates to Bedlis by Various

The atmospheric pressure by the aneroid barometer was at 29.83.

From My Attainment of the Pole by Cook, Frederick A.