Aneroid barometer

The corrections above do not appiy to aneroid barometers. These instruments shouid be caiibrated at reguiar intervais by checking them against a corrected mercuriai barometer. 

A barometer located at an elevation above sea level will show a reading lower than a barometer at sea level by an amount approximately 2.5 mm (0.1 in) for each 30.5 m (100 ft) of elevation. A closer approximation can be made by reference to the following tables, which take into account (1) the effect of altitude of the station at which the barometer is read, (2) the mean temperature of the air column extending from the station down to sea level, (3) the latitude of the station at which the barometer is read, and (4) the reading of the barometer corrected for its temperature, a correction which is applied only to mercurial barometers since the aneroid barometers are compensated for temperature effects. 

Dose,/.box can, tin capsule. Dosen-barometer, n. aneroid barometer. -ta>n-serven, f.pl. canned goods, tinned goods, -milch, /. condensed (or evaporated) milk. Dosieraidage, /. dosing plant, dosieren, v.t. determine Pharm., etc.) dose measure out. 

Air pressure is measured by a barograph, aneroid barometer, mercury barometer... 

It is the most commonly used barometer. Aneroid means without liquid. The most important part in the aneroid barometer is a small shallow metal can. Almost all the air is pumped out of it. Hence it is sensitive to air pressure. It is supported by a spring to prevent it from collapsing. Barograph is actually an aneroid barometer with a pen or a stylus instead of a pointer. It records the pressure on a rotating graph paper. 

Rolla,2 in low temperature measurements, enclosed the substance in a vacuous thin metal box, acting as an aneroid barometer, and compensated by an external measured air pressure, the movement of the top of the box being observed by an optical method. 

The second main type of barometer is the aneroid barometer, in which the cumbersome mercury column is replaced by a metal box with a thin corrugated Ud. The air is removed from the box and the lid is supported by a spring. Variations in atmospheric pressure cause the lid to move against the spring. This movement is magnified by a system of delicate levers and made to move a needle around a scale. The aneroid barometer is less accurate than the mercury type but much more robust and convenient, hence its use in altimeters. 

Aneroid Barometer Instrument that measures atmospheric pressure without using liquid. 

In the 1970 s, devices based on the aneroid barometer principle were developed, in which the deflection of a diaphragm caused changes in electrical... 

The barometric pressure used in this calculation must be the ambient pressure for the laboratory at the time of test. Many aneroid barometers, such as those used at... 

In many cases a Fortin-type barometer (Fig. M-13) is suitable. In this case the merexuy in the well is exposed to the atmosphere with the other end evacuated and sealed. All barometer readings shotdd be corrected for temperature, local gravity, and capiUary effect. Atmospheric pressure can also be measured by an aneroid barometer, which is a special type of elastic gauge. It is sometimes used in place of a manometer-type barometer because of the ease of transportation. 

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