36 



Mr. H. A. Smith on the Chemistry of 



The figures and lines are similar to those in the preceding 

 diagrams. 



The dotted line represents the amount of acid at 3 feet from 

 bottom of chamber. 



The white line represents the amount of acid at 15 feet from 

 bottom of chamber. 



Diagram III«. 



Length of chamber, in feet. 

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



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

 Length of chamber, in feet. 



Diagram III b. 



(Entrance.) 10 



; in "I 

 t. J 



Length of chamber, in feet. 

 30 40 50 60 70 80 90 100 110 120 130 140 (Exit.) 



1 5 feet in 

 heigl 



3 feet in "1 

 height. J 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



25 



18 



13 



13 



8 



7 



14 



J3to 

 14 



16 



20 



7 



3 



6 



6 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



p.c. 



8 



3 



6 



4 



4 



12 



8 



17 



20 



26 



26 



15 



12 



3 



r ii 



Li 



in height. 



J 3 feet in 

 L height. 



(Entrance.) 10 20 30 40 50 60 70 80 90 100 110 120 130 140 (Exit.) 



Length of chamber, in feet. 



The figures in the divisions of the above diagram represent 

 the percentages of nitric acid, corresponding to the lines in Dia- 

 gram Illfl. 



The numbers " 8 per cent." &c. represent the percentage of 

 acid at 3 feet from bottom of chamber. 



