Aneriod Barometer 1 : An instrument that measures atmospheric pressure with a vacuum-sealed chamber instead of a mercury column as in an ordinary barometer
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}