. Ventilation for dwellings, rural schools and stables. ity, as(lid the ribbon, for down-going;ind up-going currents maintain acontinuous fresh air supply. Nowwhile the candle is yet burning gentle stream of air from the1 liners be conveyed to tlie bottomof the jar, Fig. 10. Gradually, asthe jar fills, the flame loses inbrilliancy and finally is extin-guished. The Mame in this case is certainly not blown outby the air eurrent for the candle may be relighted and again Fig. CaiiilU huriihigpure air. in 16 Ventilation. lowered into the jar after removing the tube. The respiredair is hea
. Ventilation for dwellings, rural schools and stables. ity, as(lid the ribbon, for down-going;ind up-going currents maintain acontinuous fresh air supply. Nowwhile the candle is yet burning gentle stream of air from the1 liners be conveyed to tlie bottomof the jar, Fig. 10. Gradually, asthe jar fills, the flame loses inbrilliancy and finally is extin-guished. The Mame in this case is certainly not blown outby the air eurrent for the candle may be relighted and again Fig. CaiiilU huriihigpure air. in 16 Ventilation. lowered into the jar after removing the tube. The respiredair is heavy enough to remain and, as the candle is lowered into it, it will be extinguished,even after the lapse of more thantwo minutes if the air in the roomis still. Once more let the candle belighted and lowered into the jar,Fig. 11. Gradually raise the can-dle as the flame shows signs of go-ing out. Observe that the respiredair tends to remain at the bottom,^s may be proven by repeatedlylowering the candle, observing thatas this is done the flame tends to. Fig. 11.—The respired airtends to remain at thebottom. become extinguished. As the airis forced continually into the jarit becomes gradually filled and thelighted candle has taken the posi-tion represented in Fig. 12. Buteven here, if breathing into thejar is continued, the flame will beextinguished as the out-coming re-spired air surrounds the candleand shuts off a fresh supply fromthe flame. Clearly, then, air once i^^^- V--^^ fh<me is extin- . ^ . gnished even when held breathed is not suitable for respir- above the mouth of the unless much diluted with pure air.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectventilation, bookyear
