The Probert Encyclopaedia of Science & Technology

ANEROID BAROMETER

An aneroid barometer is a barometer first invented in the mid 19th century, not containing a liquid, but constructed on a totally different principle from a mercurial barometer. Various forms of aneroid barometer have existed, the most popular form consists of a cylindrical metal box exhausted of air, with a thin corrugated metal lid. As the pressure increases, the elastic lid is forced inwards, and when the pressure decreases the lid is forced outwards. A spring connected to the inside of the lid and to multiplying levers inside the box transmits these lid movements to an index which moves on a graduated scale. The aneroid barometer is prone to become out of alignment due to knocks and wear and tear, but is very portable and as such was used for determining the heights of mountains.
Research Aneroid Barometer