Aneroid Barometer Is the Choice of Today - Assignment Example

It was found by Gottfried Liebnitz in 1700 that the changes in the width of a hollow disc around a vacuum can be employed to measure air pressure. Lucien Vidie found that changes in the width of the capsule can be transferred to a needle in a graduated disc through a number of levers. How does it work?The aneroid barometer is effective when it is made of a flexible metal box called an aneroid cell made of even thickness and is sealed with a proper weld. The capsule is composed of a thin copper-beryllium alloy of 0.

002 in or 0.05mm thickness. The capsule then undergoes electron beam welding and is placed in a partial vacuum. The movements of the needle in the dial, as the capsule contracts and expands are very small, therefore, the chains, linkages, and levers that magnify the change and direct them to the needle on the dial should be accurately machined.The Aneroid barometer may have problems due to temperature when the capsule may expand or contract. A well-built barometer solves this problem by using a bimetallic strip that corrects pressure before indicating the same in the dial.

Altitude compensation is another problem of aneroid barometers. Standard aneroid barometers are designed to operate at 0 to 3000 ft and can be adjusted to any height within the said limits. For a height of more than 3000 ft, the barometer has to be calibrated accordingly (The Aneroid Barometer).