CH. II] 



,GAS ANALYSIS. 



39 



tion purposes. The analysis is made in the following 

 manner: — A strong KHO solution (1 in 2) is introduced 

 into B (fig. 8) until its level reaches A, and then by blow- 



1-.. 





Fig. 7. Exp. 52. 



Fig. 8. Exp. 52. 



ing down B the KHO is forced up the fine tube B and 

 into a thick-walled india-rubber tube connected with it. 

 As soon as the solution appears at the open end of the 

 tube, the clamp G is closed. The tubes G and F (fig. 9) 

 of the measuring burette are then a little over ^ filled 

 with water, care being taken that no air bubbles remain 

 in the connecting india-rubber tube. F is then raised till 

 water flows out of H; then the stop -cock L is closed and 

 H is connected by tubing with the vessel J in fig. 7 con- 

 taining the gas to be analysed. F, now nearly empty, is 

 lowered and L opened, so that a sample of gas is drawn 



