220 



G. HARKER. 



into a condenser. Steam from a separate flask could be 

 blown into the solution through the tube t, while the vapour 

 issuing from the boiling solution passed away from the 

 flask through the tube s. The corrected thermometers a, b, 

 and c gave the temperatures of the vapour from the 

 boiling solution, the solution itself, and the vapour in the 

 jacket respectively. 



The results obtained in a typical experiment are shown 

 below : — 



Te 



Steam. 



mperature of the 



Solution. 1 Am ^ alcoho1 

 vapour. 



Difference in 



Temperature. 



(I) . 



(II) (III) 



(II) "(I) 



(I) "(HI) 



127*5 



128-3 



126*5 



0*8 



1*0 



128-1 



128-5 



126*8 



0*4 



1*3 



128-6 



128*9 



127*2 



0*3 



1-4 



129*1 



129-2 



127*8 



0*1 



1*3 



129-4 



129*5 



128*1 



0*1 



1*3 



129-7 



129*8 



128*5 



0*0 



1*3 



In this experiment a strong solution of calcium chloride 

 was employed and amyl alcohol containing a little of the 

 lower alcohols was used for the jacket. The time occupied 

 was about twenty minutes. 



From the results of his experiments, Sakurai concluded 

 that he had proved beyond any reasonable doubt that the 

 temperature of the vapour escaping from a boiling salt 

 solution is exactly the same as that of the solution. But 

 although his experiments were carefully conducted the 

 results do not seem to have met with general acceptance; 

 probably owing to the doubt as to whether the vapour 

 arising from the solution did not gain heat from the sur- 

 rounding jacket. Apparently the temperature of the jacket 

 was always below that of the vapour of the solution (com- 

 pare cols. (I) and (III) in the above Table), but, on looking 



