Foe 240 Dey 
. Fig: 9. 
the proportion CO: CO, *). As to the other lines nothing is known. 
The equilibria at constant pressure. 
Of particular importance is also the progressive change of the 
different divariant equilibria with the temperature at a constant 
pressure. They form as it were the section {| the p-axis of the 
spacial p-T-x-Figure. In the case that this constant pressure is 
smaller than the pressure of the quintuple point O, for instance as 
Pp, in Fig. 8, this section becomes such as schematically represented 
in Fig. 10. Where on page 12 it is demonstrated that the quintuple 
point pressure exceeds 1 atmosphere, Fig. 10 thus also relates to 
1 atm. pressure.' 
ce 
€0, 
The divariant equilibria a, 6, c reappear in this Fig. as lines 
enclosing the fields where the different solid phases are stable. 
The lines a, 6 and c are independent of the pressure and coincide 
with the lines /, // and ///+V// from Fig. 9. The lines d and 
1) Where the equilibrium CO: CO, with FeO + Fes0, (b) and of GO: CO, with 
Pet FeO (c) is independent of the pressure and of the presence of carbon, the 
projection of II will coincide with the line 6 in the section for constant pressure 
and those of III with c. These lines have been determined by BAUR and GLAESSNER. 
