72 K. D. Kraevitch on an Approximate Law of the 

 c-C! = 2-7562x-^- =0-17226. 



According to Kopp c = 0*645, according to Kegnault 

 Ci=0-458 5 c— C!=0-187, a result which is near to 0-17226. 

 Conversely c x can be determined from the values of c and x ; 

 c x = 0-473. 



From equation (9) we have 



?/=4356-5 

 whence 



^ =4356-5x^ = 272-28. 



According to Andrews the value at 65*8° is 263*7. 

 2nd Method. 



t. 



P- 



dp 



dl' 



t. 



* P- 



dp 



o 



85 



1470-92 

 1741-67 

 2051-71 

 2405-15 



66-208 

 75-309 



105 



2806-27 

 3259-60 

 3769-80 

 4341-77 



85-292 

 96-194 



90 



110 



95 



115 



100 



120 







t ... 



r ... 



95° 100° 105° 110° 



273-13 272-28 271-42 270-56 



0-85 0-86 0-86 



0-170 0-172 0172 



The differences of the specific heats and the heat of vapori- 

 zation determined by both methods are equal. 



t. 



Pressures. 



t. 



Pressures. 



Calculated. 



Observed. 



Calculated. 



Observed. 



o 



-20 







20 



40 ... 



7-45 



28-73 



90-85 



24505 



6-27 



26-82 



88-67 



243-51 



o 



.60 



80 



120 



150 , . 



580-65 

 1235-8 

 4342-8 

 9369-2 



579-93 

 1238-5* 

 4341-8 

 9361-4 



* The figure 8 is probably a misprint, it should be replaced by 5, 



