(AD) 
If further we substitute for «,—7, and YY, the values: 
mee SDI) 
(le, sy) dee ned 
u! 
(1 ailes —1)—w#,(¢ "“ —1) 
} Sib — wv, 
and YY = Y. - 
2 == 
(lr) + a,¢ a dye Bn 
then we get by integration: 
GC 
: : 3 nn —p! 5 3 
or in connection with the value of e * Sande ‘ ” given before: 
ie 
/ —— 
D ) 
nl a el Van 
The constant Cis of course the pressure for the case that x, and y, 
are equal to zero, so it is equal to p,, and we find again equation 
(9). If we now give to p the same value as for the liquid sheet, 
we find the second branch of the curve of equal pressure. So we 
ind Tor p= 
PaP Pi 
va 
Ps PaP: 
Le, 
a line which yields y,=1 for 7, =O and: 
Ps PoP. 
UP Tt Bry, 
Ps Pe ar 
for the point of intersection with the axis for the third component. 
This value is of course the value of 4, for the pressure p, of the 
vapour phasis of the binary system consisting of the first and the 
third component. The projections of these vapour lines of equal 
pressure are again parallel. 
: ; 
Phe line: 
il 1 ( 1 ij ) ( it if ) 
heee 
P Pi Ps Py Ps Pr 
is displaced parallel to itself, when the value of p varies. The vapour 
sheet consists therefore of parallel lines and may be considered as a 
cylindrical surface. The section with the ?OX plane is a hyperbola, 
and also that with the POY plane. 
If we cut the sheet of the coincidence pressures also at the same 
