126 



Mr. H. A. Smith on the Chemistry of 



Little is to be said respecting this diagram which has not been 

 said on the former. In this also is noticeable the great fall in 

 temperature which has taken place from 10 to 20 feet from end 

 of chamber; in this case the fall is even greater than before, 

 changing here from 227° F. to 126° F., a difference of 101° F. 

 This is accounted for by the fact that the entrance-pipe is much 

 nearer this point than the former, being in fact just above the 

 spot where the temperature was observed. The regularity of the 

 heat after this sudden fall is also, as in the former case, very 

 remarkable — the variation being between 126° and 133° F. till 

 we reach 120 feet from end of chamber, when the temperature 

 falls to 110° F., the average temperature, however, being about 

 126° to 128° F., — in this case also bearing out the fact (by refer- 

 ence to exp. II., previous section) that the upper part of the 

 chamber is unnecessary. 



Diagram III. 

 Heat of Chamber 8 feet from bottom. 





10 20 30 40 



Length of chamber in feet. 

 50 60 70 80 90 100 110 120 130 140 































170 











8 

 6 

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 2 

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10 20 30 40 50 60 70 80 90 100 110 120 130 140 



Length of chamber in feet. 



