( 703 ) 
with the lowest value of 7). The result is then that the projection 
of the plaitpoints forms a curve which begins at «= O and 7’= 7%,,, 
rises from there to the highest double plaitpoint temperature, then 
falls to the lowest plaitpoint temperature, and ascends again- from 
there to 7;,. This last case has been treated more extensively 
These Proc. Vol. VII. The transformation of a branch plait ete. 
Figure 39 gives a schematic representation of the 7'r-projection 
for the first case. The point P represents the point of contact of 
. aw dp 
the two surfaces ne and ET The full line represents 
the locus of the plaitpoints, the point P., is the lowest double 
plaitpoint, and Pz is the highest. In the points Q, and G, the 
realisable plaitpoint appears or disappears on the binodal line — 
and then there is three-phase-pressure between the temperatures of 
Q, and Q,. The dotted curve, which has its lowest and its highest 
: Fig. 39 
