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Scientific American, Vol. 98, No. 20 (1908) (1908)
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way entirely off relative humidity of the air is regulated. After leav- the proportions of normal cave temperature and steam- the ‘regular “run” for visitors, and this survey was made entirely by candle light. The survey comprised and 105 feet: long,. to the plenum chamber in the “base- livered to… … the -bottom of air should never The Caves from Which the Air is Drawn. wood. The met- exceed one part al duct is used in one thousand. © 1908 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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