127) 
In order to examine this more in detail, we take the conditions 
of equilibrium for FH FH F"-+G; they are: 
rj ÒZ, , 
Fete w,) Di “Ap y 
sc | 
Z 
iy a ee (9) 
Ja 
and still two of such equations wherein the magnitudes, which 
relate to the solid substance /, have been replaced by those of 
F’ and F". With the aid of (9) we may write them also in this 
way: 
„0Z, A 
ER wissers (10) 
vy U. 
and 
r 
" 
(c tE ead Reese 1a) 
The conditions (9), one and ae are generally valid, when F, 
F’ and Ff" are situated on a straight line, we have 
(BB): (e— ea) = (@— 8B"): (a— a") =p. . . (12) 
It follows from (10) and (11) with the aid of (12) that: 
(a — e/)$+ (a —a")$4 (e’—a)f’=0. . . . (13) 
This equation (18) is at the same time the condition for the 
occurrence of the equilibrium #4 HF’ + HF", It is apparent from 
this, therefore, as has already been found above, that the equilibria 
EE HF" and F+ W+ F"+ 6 occur at the same 7 and 
under the same P. From (13) follows: 
dH. (o'—a)n+(e—a')y'+ (a'-—a)y" AH AW 
dT — (a"—a')v + (a—a''\u'4-(a'—a)o" AV TAV 
which is true as well for the equilibrium /+ /” + F" as for 
P+’ HF HG. The meaning of AH, AW and AV is easily 
seen. When we choose the reaction in such a way that AW is 
positive, then AV may be 20. The equilibrium AH WL PL G 
is fixed by (9), (10) and (14). Now we shall consider it in the 
point 7: the point of intersection of the equilibrium-curve with the 
line FFF". In this point: 
B —B):(a a) =P): (e —e)=u. ... (14) 
when we develop (9) into a series, we find: 
Ky H,—y 
(7, + 4s, )da, + (8, +t, dy, + (Zaar ( Se art 
A 
(14) 
at, 
+4 (- 0 Jan HED Jae, dy, + » (15) 
É, R 
+3 (- | Jar = 0. 
ad; ad, 
