r visitors, and this survey was ing the fan the air goes through a duct 4 by 7 feet heated cave air which are to form the body of air de- made entirely by candle light. The survey comprised and 105 feet long, to the plenum chamber In the "base- livered to the room. The section elevation shows this… … UopjilgM 1WJD by J. D. S trickier. the bottom of air should never The Caves from Which the Air 1b Drawn. wood. The met- exceed one part al duct is used In one thousand. HOW CAVH All IS VS1D TO M6ULAT1 TH1 TIKPMATUU 07 A HOTTtt. ) 1908 SCIENTIFIC AMERICAN, INC
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