1892.: 



On certain Ternary Alloys. 



377 



form 25 per cent., water 25 per cent., and acetic acid 50 per cent., 

 not separating into two fluids at 18, as previously described. The 

 point marked L is the " limiting point," deduced from the above 

 figures by means of two different graphical methods suggested by 

 Sir G. G. Stokes. 



By the first method, the percentages of chloroform, water, and 

 acetic acid in the heavier liquid being respectively indicated by A, B, 

 and C, and those in the lighter liquid by A', B', and C', the values of 

 A B (positive quantities) are plotted off as abscissas to the right, 

 and those of A' B' (negative quantities) to the left of the origin, 

 the values of C' C (positive) being used as ordinates for the first 

 set of abscisses, and those of C C' (negative) for the second set. 

 Fig. 2, curve No. 1, represents the plotting thus obtained ; by joining 

 the ends of the two portions of curve thus laid down by the dotted 

 line 11, 11, as shown, a point, a, is deduced where this dotted line cuts 

 the base line. This point, o, corresponds with the " limiting point," 

 where the lighter and heavier alloys merge into one ; when the 

 plotting is carefully made on a sufficiently large scale, the position of 



