Bourdon Gage 2 : A pressure gage which has a curved, flat tube that changes its curvature as pressure changes; this movement is then transferred mechanically to a pointer on the dial
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}