ed ee an 
( 543 ) 
chosen for this. Of course one point D had to be taken on the left 
of the locus PQ, the other on the right. 
The pressure on the connodal curve being maximum for that 
mixture, the connodal curve must touch a curve of equal pressure 
both in D and in D’. On the left and on the right of D and also 
of D' the connodal curve must pass on to isobars of lower pressure. 
If we assume the maximum pressure of the first component at the 
chosen temperature to be equal to pc, and that of the second com- 
ponent to be lower e.g. pa, the connodal curve has a shape as is 
represented by the somewhat heavier curves CEDFB and C"E"D"F"B", 
But we must take care that ag >er and ej Zep. 
36% 
