( 173 ) 



Here too tlic values of ft'^ ^I'e not ficcurate on tlie borders of the 

 curve. In fig'. 4 the results have been represented. Here too the 

 points give a condnuous curve. 



The critical pressures of the components l)eing llic same for this 

 mixture, the second term in the e(puili())i: 



(■'■■r, = —7r, 



f dT,.,. (I ioij Per 



+ 



T dx^ ' dx^ 



will be small compared to the (irst. if we take for fi^, <>nl,v the 



/■ dT,, 

 term — ^ — — and it we assume linear dependence of T^- on .i'., 

 1 dx, 



theji 



dT,,. 



dx\ 



is here about — 40, so ft Vj about J. In this neighbourhood 



also the values of ft'.,, are found. 



Also in this case fi".,^ is determined from the equation 



- • y- = (■v,-^,) — 



p (U-j I .f, (I— .t'l) 



I " 



+ ft X, 



The values found from this are given in Table X. 



T A H L E X. 



Here too the value of ft".,, for .i\ =z 0,7, 0,(S and 0,9 is not very 

 reliable on account of the small value of ./'./-. 'i. 



The quantity ft".,-, proves again to be negative and iji aI)SoIute 

 value smaller than 4. 



From the course of the curve ft'.,, =zz /*(,)',) apj)ears that it seems 

 to have two points of inllection, one at about .r, = 0,3, the other 

 at about .I'l =: 0,7. It is remarkable that this also follows from the 

 change of the ft".,, jji Table X; just as we had to expect trom the 

 course of the cui-\'e ft'.,, =/■(,>•,) ft".,., gets a maximum at about ./■, = 0,3, 

 and a miuimum at .i'j = 0,7. 



12* 



