Instrument Shelter 2 : A naturally or artificially ventilated structure used to hield temperature-measuring instruments from direct sunshine and precipitation. See: Thermoscreen
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}