1892.] 



On certain Ternary Alloys. 



25 



Fig. 4 represents the critical curve deduced from these values ; the 

 point marked A represents a mixture of metals that did not separate 

 into two ("real" alloy, containing Ag = 59'9, Bi = 37'3, Al = 

 2-8). 



The outer dotted line is the corresponding curve, obtained as above 

 described, with aluminium-lead-silver alloys, distinctly illustrating 

 the raising of the curve brought about by the substitution of lead 

 for bismuth with aluminium and silver, just as previously found for 

 zinc and tin, zinc and- silver, and aluminium and tin. 



The inner dotted curve is that obtained with zinc- bismuth-silver 

 alloys (Part V) , omitting the bulges, illustrating the effect of substi- 

 tuting aluminium for zinc in raising the curve, just as in the pre- 

 vious cases with lead and tin, bismuth and tin, and lead and silver. 



Obviously no marked irregularity of contour is noticeable, nor 

 any change of direction of tie-lines, nor any tendency to converge 

 to a point, apparently indicating the absence of any tendency of 

 aluminium to form definite compounds with silver, like those formed 

 by zinc with silver or tin. 



All the tie-lines slope to the left, just as in the case of the other 



