( löl ) 



heat required was furnished by an alternating- current, easily obtai- 

 ned by the installation of Electra which is found in the laboratory. 

 This current is led through a spiral, wound round the inner cylinder 

 of the boiling-vessel, the ends of which have been sealed through 

 the glass of the outer cylinder. A necessary condition for the remai- 

 ning constant of the temperature proved to be that the spiral remained 

 entirely merged in the liquid. 



The glass forcing-tube containing the mixture was then placed 

 nearly in the axis of the inner cylinder with a thermometer and 

 the tube of the electro-magnetic stir-apparatus near it. Tlie space 

 was then closed with wads on both sides. The thermometer was 

 quite inside that part of the inner-cylinder, where the temperature had 

 proved to be the same throughout. Therefore correction for the sticking 

 out of the mercury was not necessary. AVithin the same space the 

 mixture which was to be examined and the tin tube were placed. 



The mixture was now brought to about the temperature of com- 

 plete mixture, which took about an hour. Then the temperature 

 was made to rise a little under continual stirring; after a moment's 

 rest it was made to rise again etc., till the cloudiness (the proof 

 of the presence of two phases), had quite disappeared. Then the 

 temperature was read. After that the temperature at which the 

 cloudiness reappeared was determined in the same way by cooling 

 the mixture. By repeating these observations a few times, the 

 temperature of complete mixture could be very accurately determined. 

 (The thermometer was verified at the Reichsanstalt). In the same 

 way the temperature of complete mixture by greater pressure was 

 determined. The results of these observations follow : 



22 7o X — 0.05 

 pressure: norm. 30 GO 00 120 150 180 atm. 



temp, of compl. mixt. :()(;. 7 (iG.T (i(i.!) G7 G7.1 G7.2 G7.3 



pressure: norm. 30 60 'JO 105 130 atm. 

 temp, of compl. mixt. : G7.G G7.G G7.8 G7.8 G8 G8.1 



38 7o ■'• = 0.11 



pressure: norm. GO 90 atm, 



temp, of compl. mixt. : 67.3 67.5 67.7 



