262 



Sir James Dewar 



[Jan. 16, 



is seen to be negligible. Comparison distortions of the membrane 

 by weight at ordinary temperatures and in liquid air have already 

 been described. 



PRESSURE 



OSS. .of ALCOHOL 



5 MINUTES 



Fig. 11. — Cell without Chaecoal. 



PRESSURE 

 CMS. of ALCOHOL 



16 T 



W AIR 

 ^ | & HYDROGEN 

 HELIUM 



5 MINUTES 



Fig. 12. 



Curves comparing the sensibilities of the cell when the charcoal 

 is saturated at liquid air temperature with air, hydrogen and helium 

 respectively are collected in Fig. 12. 



