378 Mr. E. B. H. Wade. On a new Method of 



Fig. 1. 



well, but the condensation was so rapid that the contents of the 

 U-tubes accumulating became unmanageable. The difficulty was 

 only partially overcome by jacketing with flannel. The trouble was 

 all the greater, inasmuch as the estimation of temperature by the 

 platinum method requires some little time. The only possiWe way 

 of obviating this condensation was to employ a steam-jacket, and in 

 order to do so the apparatus was completely reconstructed, so that it 

 assumed the form described in the next section. 



§ 3. The Apparatus employed. 



The apparatus which is about to be described is that which yielded 

 the experimental numbers.* Although its principle is fully contained 

 in the very simple model of the last section, yet its form is somewhat 

 complicated. 



* f Roy. Soc Proc.,' vol. 61, pp. 285— 2S7. 



