1680 
the quantities of the phases, which have a negative sign in (12) or 
(19) are diminished. Now from the invariant equilibrium a mono- 
variant equilibrium (X_) is formed, in which X_ represents a phase 
with negative sign, therefore, a phase from one of the groups 
RS or Lof (49): 
With the aid of the first of the properties mentioned above, 
which defines the direction of a curve, from the sign of the change 
in volume at the isentropical reaction, we find: 
le. AV >O. Starting from the invariant point the curves (A4) 
go towards lower- and the curves (X_) towards higher pressures. 
Ih, AV<O. Starting from the invariant point the curves (14) 
go towards higher- and the curves (A) towards lower pressures. 
When we let the isovolumetrical reaction (13) occur between the 
phases of the invariant equilibrium and when we apply the second 
of the properties mentioned above, then we find: 
[Ie Ly > 0. Starting from the invariant point the curves (X4) 
go towards higher- and the curves (A) towards lower temperatures. 
Il’. Ay< 0. Starting from the invariant point the curves (4) 
go towards lower- and the curves (X_) towards higher temperatures. 
TABLE 1 
di uk B B Rass c T 
EN bey easy. cp Ree rece eae gen) lea (a) 
Ais pam Poe | gt eS ip ee Hol Oj On 
AP i= Bhs a IL meee | pee |= te AV>0 (©) 
IE te eee ie 4s An>0 (d) 
ARO fenre else enn sai caee | onsen sane VSO) 
AP | eeed | eevee | Seeee Ederen | eren | desse | eres | Ax<0 (5) 
AP [ass | Han EA Bee sn Sy eae ON) 
Ny jie bee fesse | meee BP AN ees ME |e inne (A) 
| | 1 | 
AP sien Marente letttseamitietans seal melas [otros oiilt ons | AV<0 (i) 
ADs | aot ieee deedeetee eeen deet nl Onec0 (Be) 
| | | | 
aP 
DIA re eT, AS O 
