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The New International Encyclopædia/Downcast

From Wikisource

Edition of 1905. See also Glossary of coal mining terminology#D on Wikipedia; and the disclaimer.

DOWNCAST. The name of a shaft used for ventilating mines. The foul air is made to ascend through a line, or in old-fashioned workings by a fire burning at the bottom or by a fan blower, while fresh air descends through the downcast.