Smoke Eye 2 : A device designed to measure smoke in a flue gas by measuring the obscuration of light between a light source and a photoelectric cell. See: Smoke Density Monitor
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}