Automatic Sprinkler 1
Automatic Sprinkler 1 : (Fire Pr) A water-spraying nozzle head, held in closed position by a low-melting alloy link, frangible bulb, or chemical pellet, installed in a pipe grid. See: Sprinkler-System. Note: When hot gases or flames weaken or destroy the holding element, the nozzle opens and sprays water or other extinguishing agent on the surrounding area