Bourdon-tube gauge

Bourdon-tube gauge [boo r-dn toob, -tyoob, bawr-, bohr-, boo r-dawn-] Word Origin noun Chemistry.

1. an instrument for measuring the pressure of gases or liquids, consisting of a semicircular or coiled, flexible metal tube attached to a gauge that records the degree to which the tube is straightened by the pressure of the gas or liquid inside.

Origin of Bourdon-tube gauge 1900–05; named after E. Bourdon, 19th-century French inventor