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aneroid barometer

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aneroid barometer

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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

aneroid barometer

[′an·ə‚rȯid bə′räm·əd·ər]
(engineering)
A barometer which utilizes an aneroid capsule. Also known as aneroid.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

aneroid barometer

aneroid barometer
An instrument that measures the atmospheric pressure. It consists of a cylindrical vacuum chamber with corrugated tops and sides. A system of springs within the chamber prevents the chamber from collapsing as a result of outside air pressure. A pointer through a suitable gearing indicates the expansion and contraction of the aneroid, according to the atmospheric pressure. Also known as a siphon chamber.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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Aneroid barometers could be set in simple round cases rather like clocks, and were also enclosed in traditional banjo cases, with a thermometer included above the dial.
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He was known to have performed an experiment comparing the performance of the new aneroid barometer supplied by Negretti and Zambra against that of the mercury barometer.
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