(AV )y, (AV), and ( 
(AH )m , 
(AH)g and aoe vy >0; 
rc 
‘ 
Goes: 
879 
(AV)z and (AV )y< 0 
sunt and (AH), < 0. 
The isovolumetrical reaction becomes: 
IAA GEL 
(L) 
Towards lower 7’ 
(AH)y <0 
(Z) (Zn) (A) (G) 
Towards higher 7’ 
The isentropical reaction becomes: 
(Za) UL) 
Towards lower P | 
Ley aera 
higher, 
When we compare the 
another, 
fig 4 (XII). This must, of course, be the case, as the phases, 
AL 
| (Z) (A) 
Towards higher 
(Zn) 
pe OZC 
P 
From both these reactions it Gee 
that the curves must be situated « 
(™) i in fig. 6 with respect to their direction 
lei 
as in 
of temperature and 
apparent 
that, 
pressure. 
in the same way 
just as in fig. 5, also in fig. 
curve (7) must be situated 
(G) and curve (G) above (A). 
The only difference between fig. 5 
and 6 is this: curve (Zj) goes, 
starting from 1 in tig. 5 towards 
above 
fig. 
in fig. 6 towards lower pressures. 
P,7T-diagrams deduced above, with one 
then we see that they belong to a same type, viz. that of 
G, Zin 
Z, L,, and A are situated with respect to one another in the same 
way as the five phases in tig 
o ‘ 
3 (XII: 
In a P,7-diagram we imagine a curve \+ )+L-+4G, to be drawn 
in which X and Y repres 
a point of maximum-pressure, 
ent two salts. On this curve is situated 
there may also be situated a point 
of maximum temperature. We call the part at the left of the point 
of maximum pressure (he 
point of maximum pressure 
the descending branch and t 
ascending branch, the part between the 
and the point of maximum temperature 
he other part the returning branch. 
The difference between the figs 2—6 is dependent on the position 
of the invariant point 
ascending branch of each o 
IN, 
te descending branch of 
f (Z,), in fig. 4 on the d 
7 and (Z,) in 
2 
In fig. this point is situated on the 
f the curves (7) and (Z,), in fig. 3 on 
curve (7) and on the ascending branch 
escending branch of each ‘of the curves 
fig. 5 on the returning branch of curve (7) and on 
