FACTORY FIRE: IT WAS LIKE ÒA PLASTIC PUP TENTÓ
Just before the 3:30 p.m. quitting time last March 19, employees at Parnell Industries in Mercersburg, Pa., a manufacturer of precision machined parts, heard a loud popping sound. A plastic air line in the cockloft had been ruptured by a fire that had been spreading undetected inside a wall and overhead.