1890.] On certain Ternary Alloys. 25 



May 8, 1890. 

 Sir G. GABRIEL STOKES, Bart., President, in the Chair. 



The Presents received were laid on the table, and thanks ordered 

 for them. 



The following Papers were read : 



I. "On certain Ternary Alloys. Part II." By C. R. ALDER 

 WRIGHT, D.Sc., F.R.S., Lecturer on Chemistry and Physics, 

 and C. THOMPSON, F.C.S., F.I.C., Demonstrator of Chemistry, 

 in St. Mary's Hospital Medical School. Received April 3, 

 1890. 



In Part I, it has been shown that when the three metals lead, zinc, 

 and tin are fused together and well intermixed, and the mixture 

 allowed to stand molten for some hours at a nearly constant tempe- 

 rature, a single homogeneous alloy results if the proportion of tin 

 present exceeds a certain limiting amount (about three-eighths of the 

 entire mass) ; but with smaller proportions of tin the mass divides 

 itself into two different ternary alloys of unequal density : the 

 heavier contains chiefly lead, together with some of the tin, and as 

 much zinc as the lead can dissolve in presence of the particular 

 proportion of tin associated with it; whilst the lighter mainly 

 consists of zinc, with the rest of the tin, and as much lead as the 

 zinc can dissolve in presence of that tin. 



We have found that analogous results are obtained with various 

 other ternary mixtures of metals, A, B, C, such that whilst A and B 

 are not miscible together in all proportions (like lead and zinc), C is 

 miscible in all proportions with either A or B separately. Of such 

 mixtures, the following are examples : 



Heavier metal, A. Lighter metal, B. Third metal, C. 



Lead. Zinc. Tin. 



Lead. Zinc. Silver. 



Lead. Zinc. Cadmium. 



Lead. Zinc. Antimony. 



Bismuth. Zinc. Tin. 



Bismuth. Zinc. Silver. 



Lead. Aluminium. Tin. 



Lead. Aluminium. Silver. 



Bismuth. Aluminium. Tin. 



Bismuth. Aluminium. Silver. 



