394 Prof . Adeney and Mr. Becker: Determination of Rate of 



(b) Modified form of Experimental Tube used. 



Owing to the difficulty in obtaining apparatus, it was 

 decided to make the required modification of the experi- 

 mental tube in the laboratory. It was designed and made 

 as shown in the diagram (fig. 5). At the upper end of the 



Fio-. 4. 



tube there is a hollow stopper A ground in, which controls 

 the connexion to the manometer D and the gas reservoir C. 

 This stopper also has a stopcock F t fused on to it at the top 

 to permit of the tube being filled with water when used in 

 conjunction with another stopcock B, fused on to the lower 

 end o£ the tube. The manometer I) and the gas reservoir C 

 are fused on to the tube in such positions that the openings 

 correspond with the holes in the stopper. The whole 

 apparatus is provided with a water-jacket as shown, through 

 the bottom cf which the ends of the gas reservoir and the 

 manometer project, in order to allow them to be connected 



