541 



KCt), =A.2.3+Ö,., +L +G 

 (A.2.o)6 = KCl + Z>i.i + L + (? 

 fA.i)6 = /^C"/ + Z>,,2.2+ L 4- G 

 (L),, = KCl + A.2.0 + i),.i + 6' 

 {G)i = /CCV + A.2.2 + Z.»,.! + £ 



The equilibria {C'it^)f and {KCl)b are the same, as is apparent 

 from the occurring phases. In fig. 7 ƒ6 represents the solutions of 

 the eqnilibrium {KCl)b, be represents the solutions of the equilibrium 

 (A.2.2)/), and nb those of the equilibrium (D1.1J4. 



Fig. 8 gives a figure of the /-*, T'-diagrani, which is experimentally 

 defined '). This is somewhat schematized for the sake of clearness. 

 The point /' represents the quintuplepoint witli the phases: 



Cih, D,:2,i, A.,, Lf and G 

 the temperature is 56.1°, the pressure is ± 73 mm. of mercury. The 

 curves {Cm)f, (A.2.9)/, (/>)/• and I Dii)/- starting from this point, have 

 been defined experimentally. tJurve {G)f has not been defined; it 

 is apparent, however, that it must proceed in fig. 8 steeply onwards, 

 a little to tiie right or to the lel'i. 



The five phases of the quintuplepoint form a moiioroncave 

 quintangle in fig. 7, its sides Gf,/Cih, Cuo Dn, A.i i)i.2 2and öi.ooCr 

 are dotted in fig. 7. [The point /' therefore, corresponds vvitii the 

 point 4, the points (t and Cu..^ with the points 1 and 2 of fig. 3]. 

 When we take a diagonal succession of tiie |)liases, then we l.ave, 

 starting from G: 



G, Cu-2, Di22 . Lf and Z)| 1- 

 In the /-*, 7-diagram consequently the succession 



{G}f, {Cu^f, (D,.2,)/, (%, (A.i)/ 

 must occur, whicli is also found experimentally, as is apparent from 

 fig. 8. The metastable continuations of the curves are not drawn 

 in fig. 8; we find them by the same discussion, which has led us 

 to fig. 4. So far as some of these metastable conditions have been 

 realized, they are in accordance herewitii. 



The point b represents the quintuplepoint with the phases: 

 KCl, A.,..>. A.i, U and G 

 the teuqierature is 93.3', the pressine ±340 m.m. Hy. The curves, 

 starting from this point have been defined experimentally, except 

 curve (6-%; it is apparent, however, that this must proceed in fig. 8 

 steeply onwards and a little to the right or to the left. 



The 'axQ phases form a biconcave quintangle, the sides of 

 which are: W.b, b.D,,u i>,.i.A3.2, Di.o. • A'67 and /iTC/ . f? [The 



1) J. G G. Vriens, i.e. fig. 6, p. 208. 



35* 



