(= ES: dy ; 
9-0 
it is also possible to obtain the coexisting phases by rolling a tangent- 
plane over this '-surface. y” as function of z' and v’ presents 
the form 
WP =e, a? + d, a! v!? +e v'* (Kortewse’s equation 4). 
Hence for the connodal curve Korrmwse’s deduction may be 
applied, and we find for the equation of that curve 
e . 
seems testa (equation 8 1. ¢.). 
m is now found from 
m ay + i zl (equation 34), 
Ox? JT 0x0v / pr 
where the differential quotients are taken for the plaitpoint, so that 
for a substance with a small proportion of one component, to the 
first approximation 
1 Op 
MU a ie av . 
MRT \ Ox) yg"? 
Further we may put, leaving out terms of higher order, according 
to equation (39) 
ON amr (oe 
ae (5) 
da 
Using the property that for the point of contact aes 0, this 
f v 
1 
Pe ree OS 
: 2MRT7, 
yields: 
Ow vy 0 ) = 0? 
UTr— UT pl =a ET, k me > | i) + MRT), aa | UT pl 
arro (5) & JvT ‘ cM 
Dv 
and 
