774 



When we consider the saUiralionourve going tliroiigli the point 

 F in fig. 5 (XI) and fig. 6 (XI), then for Ihis point ?/ = j?, conse- 

 quently, according to (15) S= oo. From (13) follows also A \\= '/). 

 Therefore we take (12); from this follows for y ~ i^ 



( 



f] ^^ (I'l 



As fig. 5 (XI) and fig. 6 (XI) are drawn for Y^v. the pressure 

 must increase starting from F along the saturationcurve going 

 through F. 



As the pressure increases starting from F along the saturation- 

 curves under their own vapourpressure of fig. 6 (XI) and decreases 

 starting from a point //, situated in the vicinity of H, somewhere 

 between F and n must consequently be situated a point, starting 

 from which the pressure neither increases nor decreases. This point 

 is, therefore, the point of maximum- or of minimumpressure of a 

 satui-ationcurve, and is not situated within the componenttriangle, 

 but accidentally it falls on side BC. It follows from the tigure that 

 this point is a point of minimumpressure; we shall call this the 

 point m. 



The limitcurve (viz. the geometrical position of the points of 

 maximum- and minimunqiressure) goes consequently through the 

 points m and R; it represents from m to R points of minimum- 

 pressure; starting from R further within the triangle, it represents 

 points of maximumpressure. This latter branch can end anywhere 

 between H and 6' on side BC. 



The terminatingpoint of a limitcurve on side BC can be situated 

 between i'^ and 6', but cannot be situated between 7^ and i^. A similar 

 terminatingpoint is viz. a point of maximum- or a point of minimum- 

 pressure of the saturationcurve, going through this point. Consequently 

 in this point along this saturationcurve clF^O; from (16) it follows 

 that then must be satisfied : 



S = x, or /it + (/y-/i) .^^ = (18) 



Herein .f and a\ are infinitely small; their limit-ratio is determined 

 by (5). As .r and .i\ are both positive, it follows from (18): y <dt 

 The leruiinatingpoint of a limitcurve must, therefore, be situated 

 between F and C (fig. 6) and it cannot be situated between F and 

 B. In accordance with this we found above that one of the ends 

 of the limitcurve is situated in fig. 6 (XI) between n and F. 



Now we must still consider the case mentioned sub 4 (XIV), viz. 

 that the solid substance is one of the conqionents. A similar case 



