32 



Mr. H. A. Smith on the Chemistry of 



Or if we take the following Proportional Tables, we shall see 

 the variations (numerical) more plainly. 



No. I. At 15 feet height. 



Feet from end of chamber. 

 120 =1 



80 V- 1-7 



100 J -1 ' 



110 =1-8 

 50 =1-9 



60 =2 



9o}- 2 ' ; 



40 =2-5 

 30 =3-5 

 20\ 

 10/ 



5-5 



No. II. At 3 feet height. 



Feet from end of chamber. 

 10 =1 



130J ^° 

 120 =4-3 

 110 =4-6 



140J =53 

 90 V=5.6 



100 

 60 

 70 

 80 

 50 

 40 



= 6 

 = 6-3 

 = 6-6 

 = 93 

 = 9-6 



In looking over Diagram I a, it may be noticed that there are 

 three distinct falls in the percentage of acid, and after each there 

 is again a slight rise. It may be interesting to remark that 

 almost exactly at those parts were the points at which steam was 

 thrown into the chamber. The falls are at 20 feet, 70 feet, and 

 110 feet respectively, steam being injected at 20 feet, 65 feet, 

 and 110 feet. 



The tremendous fall occurring from 20 feet to 40 feet may 

 be accounted for by the great amount of steam entering the 

 chamber at this point — as not only was it entering at 20 feet, 

 but also, along with the gases, at a little below the large iron pipe 

 at the end of the chamber; so that the steam absorbs a large 

 amount of the hot sulphurous acid. 



In the analyses at 3 feet these falls are not so noticeable, are 

 indeed not so great, the acid here being out of the immediate 

 action of the steam. In these experiments the temperature of 

 the chamber was kept as low as possible, and the amount of 

 steam allowed to go into the chamber was, as far as could be 

 determined, almost one quarter the volume of the mixed gases. 

 This, then, tends so far to show, what I previously imagined, 

 that the upper portion of the chamber was of use principally as 

 a reservoir for the sulphurous acid, allowing it to descend as it 

 was required to the lower or working portion. This was also 

 tried in another way. 



