Quartzoid Bulb Detector : A fixed-temperature fire detector in which the expansion of a liquid within a sealed bulb shatters the bulb, thereby permitting the making of an electrical contact
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}