102 



DE. B. D. STEELE, DK. D. McINTOSH AND DR. E. H. ARCHIBALD 



Fig. 1. 



The vacuum vessel A was closed by a large indiarubber stopper, through which 

 holes had been cut to allow the passage of the stem of the thermometer, the apparatus 

 containing the liquefied gas, and the tubes I), d, and /. 



The closed tube b was about 7 millims. in diameter and long enough to reach nearly 

 to the bottom of the vessel. The tube d was placed so that its open end came 

 immediately under the tube b. 



The large vacuum flask B was fitted with tubes as shown in the diagram, so that 

 by blowing into / liquid air could be forced into the tube b. 



In order to obtain any desired temperature between that of the room and the 

 melting-point of ether ( 117) the vessel A was filled with ether, and the tube d 

 connected to an air blast, by means of which the liquid was continuously and 

 uniformly stirred, the air escaping through the tube I, which was provided for the 

 purpose. 



After mercury had been taken out of the manometer through k, the ether was 

 cooled by blowing liquid air from B into b, where it rapidly boiled away. When the 

 temperature of the bath had been adjusted, it could be kept constant for as long as 

 was desired by blowing liquid air in very small quantities into b. 



The deposition of dew on the walls of the vacuum vessel A was prevented by 

 placing it inside a wider cylindrical glass vessel containing phosphoric anhydride. 



