A name applied to certain types of apparatus worn by workers, permitting
them to work in noxious or irrespirable atmospheres such as obtained
during mine fires, following mine explosions, as a result of accidents in
ammonia plants, from smelter fumes, etc. Oxygen compressed in a cylinder,
a regenerating substance to purify the breathed air, and a closed system
constitute the general principle of the apparatus.
See also: mine rescue apparatus
Dictionary of Mining, Mineral, and Related Terms