(Rarely called holosteric barometer, metallic barometer.) An instrument for measuring atmospheric pressure. It is constructed on the following principles: An aneroid capsule (a thin corrugated hollow disk) is partially evacuated of gas and is restrained from collapsing by an external or internal spring; the deflection of the spring will be nearly proportional to the difference between the internal and external pressures; magnification of the spring deflection is obtained both by connecting capsules in series and by mechanical linkages. The aneroid barometer is temperature compensated at a given pressure level by adjustment of the residual gas in the aneroid or by a bimetallic link arrangement. The instrument is subject to uncertainties due to variations in the elastic properties of the spring and capsules, and due to wear in the mechanical linkages. See barometer, aneroid barograph, pressure altimeter, altimeter-setting indicator. U.S. Weather Bureau, 1941: Barometers and the Measurement of Atmospheric Pressure, Circular F, 7th ed., rev., 21â€“25.
An instrument for measuring atmospheric pressure in which a needle, attached to the top of an evacuated box, is deflected as changes in atmospheric pressure cause the top of the box to bend in or out.
An instrument used to measure air pressure through the expansion and contraction of a sealed metal chamber which has been partially emptied of air.
An instrument designed to measure atmospheric pressure. It contains no liquid.
A barometer introduced to the domestic market, c.1850, which used disk-like, flexible metal bellows containing a partical vacuum, instead of a collumn of mercury, to measure changes in air pressure. The term aneroid is derived from a Greek word meaning 'liquid-free'. As the air pressure changes, the movement of the bellows is enlarged by being linked to a pointer set againsta dial.
a barometer that measures pressure without using fluids
a barometer that uses a closed container rather than a mercury column to
a more compact instrument for
an instrument that depends on the changing volume of a container to indicate atmospheric pressure
A barometer which operates on the principle of having changing atmospheric pressure bend a metallic surface which, in turn, moves a pointer across a scale graduated in units of pressure.
An instrument used for measuring atmospheric pressure. It's main advantage over a mercury barometer is its portability.
An instrument designed to measure atmospheric pressure. It is usually a small box-like object that is completely sealed. It expands and contracts with varying pressure. The aneriod's changes in size are measured to calculate pressure.
A device to measure air pressure that uses an aneroid, which is a sealed, flexible metal bellows with some air removed that expands and contracts with air pressure changes.
An instrument that measures the atmospheric (barometric) pressure. and operates on the principle of having changing air pressure bend a flexible metallic canister, which is partially evacuated. An external or internal spring prevents the capsule from collapsing. Changes in the size of this aneroid capsule are proportional to the difference between external and internal pressures, which in turn, move a pointer across an indicator scale or a pen on a recorder chart.
barometer in which the action of atmospheric pressure in bending a metallic surface is made to move a pointer
An instrument built around a metal structure that bends with changing air pressure. These changes are recorded on a pointer that moves back and forth across a printed scale.
A barometer which measures atmospheric pressure using one or a series of aneroid capsules. Also called holosteric barometer.
An instrument for measuring the atmospheric pressure. It registers the change in the shape of an evacuated metal cell to measure variations on the atmospheric pressure. The aneroid is a thin-walled metal capsule or cell, usually made of phosphor bronze or beryllium copper. The scales on the glass cover measure pressure in both inches and millibars. Related term: mercurial barometer