76 



AKT. 10. K. IKEDA : STUDIES ON THE 



on the surfaces having equal 

 vaUies must be straight lines 

 parallel to the axis of y. The 

 projections of these locii upon 

 the plane of composition may be 

 called equifractional curves. In 

 the present case they may also 

 be called equipotential curves, 

 because they are the locii of 

 points at which the chemical 

 potential has equal values. 

 These are of course straight 

 lines parallel to the axis of y. 

 The surfaces of 6'i and d 

 are perfectly similar, hence we 

 need consider but one of them. 

 The surface is bounded on one 

 side by the binary curve Fig. 

 12 ;-, and on the other by a 

 straight line as shown in the 

 annexed diagram. On solving 

 equation (57) C{i can be ob- 

 tained as an explicit function 

 of D., %, Ty and x ; and the 

 equation for the surface of d 

 has the following form 



v/{H-(v-l)^(D,S, 7»}...(60) 



As Cß is independent of y we have for constant Ci 



