6*4 K. D. Kraevitch on an Approximate Law of the 



t. 



p. 



dp 

 di' 



t. 



p. 



dp 



21' 



o 



45 



1074-15 

 1264-83 

 1481-06 

 172501 



45-946 

 51-707 



o 



65 



1998-87 

 2304-90 

 2645-41 



57912 



50 



70 



55 



75 



60 







From whence by means of equation (10) we construct the 

 table : 



c—c. 



50° 





60° 





65° 



90-203 



0-367 

 00734 



89-836 



0-380 

 00760 



89-456 



According to the first method we found r Q = 89*688, and 

 according to the second method =89*836 ; notwithstanding 

 their different origin these figures may be considered the 

 same. The values of c — c x also proved to be very similar; 

 according to the 1st method 0*0751, and the mean of the 

 two quantities found by the 2nd method 0'0747. All this 

 indicates the truth of the propositions serving as the base of 

 the theory. 



-Knowing x and y, it is possible to calculate the vapour- 

 pressure of ether by equation (7), which in this instance takes 

 the form 



log 



V 



148*79 



= - [log 3=3 -m L —^- J 2*77986 



Lt~333J 



-\-m ff. 



3318*74. 



t. 



Pressures. 



t. 



Pressures. 



Calculated. 



Observed. 



Calculated. 



Observed. 



o 

 -20 , 



.. ,, 



20 



40 



50 



65-81 



182-03 



432-14 



907-59 



1265-70 



68-90 



184-39 



432-78 



907-04 



1264-8 







70 





 110 

 120 



2307-7 

 3891-1 

 6257-5 

 76173 



23049 

 3898-3 

 6214-6 

 7719-2 



