( 358 ) 



Fio-. 7, 



li,üni-(\ passiiiij,- llii-oiiiili n poiiil .1 of llic upper hraiicli. or llii-diiLili 

 a point \\ liicli lias iiol liccii iiKlicalcd ami w liicli would lic on liu» 

 lower lirancli. 'I'liis projcclioii of tlic llircc-pliaM'-prcssiirc is dciioted 

 1)\ a ciii'Nc, which coiisi>ls of allci-iialc dols and dashes. So hesides 

 1\ also ihc point .1 is a point of the section of the two ( jk 1\ -i) 

 surfaces for the \alue of ./■ chosen; the poi]it J. how e\er. at lower 

 teuipei'atnre. 'Idie two cur\-es All and I^CI) indicate fnrthei' points 

 of the section for constant Nahu- of ./■ of the solidllnid sui'face. 

 in so far as tliis section doe-- not lie within the rcLiion, in which 

 one llind phase splits up into two llnid phases (li((uid and \aponr). 

 Instead of the lluMn-etical course of the section hetweeu the point 

 A and l\ w (^ Lict the lhree-phase-pressui-(\ 



There is one circuuistance. which decides whether the course of 

 the cur\(' of the three-phase-pi-essure is as it has heen trace<l. so 

 running to a point A of the li(pnd sheet, oi' ^^llethel• it ou^ht to 

 iMin to a point of the \apour sheet. For a \alue of .r Ivinu' nearer 



