Bimetallic 2 : Denoting a strip or disc comprised of two metals with different coefficients of thermal expansion; upon heating it bends due to unequal expansion
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}