Issue 1 and Volume 87.

CORRESPONDENCE Protection for Tunnels To the Editor: Fire in underground workings where an air lock is used presents a difficult problem to the Fire Department from the point of fire-fighting and rescue work. Fire, starting where high air pressure is used, makes flammable materials burn fast and more readily. In workings of this type, shavings and hay are used to absorb seepage water. Due to the rapid spread of fire, the men working in these places are invariably trapped. To open an air lock to let smoke or fumes out might cause these men to be engulfed in water or mud which would enter when the air pressure is lowered. A high air pressure is depended on to prevent water or mud from entering the shaft or tunnel. Therefore, 1 would recommend an automatic fire alarm system and an automatic sprinkler system equipped with heads of twenty to thirty degrees…

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