L60 



Dr. Alder Wright and Mr. C. Thompson. [Feb. 



On plotting these figures as curves it is noticeable that, whilst the 

 distribution of the tin between the heavier and lighter alloys formed 

 is only slightly different according as the temperature is 650 or 750, 

 in each case the curve is of an entirely different character from that 

 deducible from the previous experiments with lead, zinc, and tin. 

 Instead of rising above the base line to a maximum and then falling 

 again, ultimately crossing the base line and passing below it, each 

 curve lies completely below the base line. Curves Nos. 1 and 2, fig. 1, 



FIG. 1. 



Percentage of Tin in Heavier Alloy . 



respectively represent the above values at 650 and 750 ; whilst No. 3 

 represents the corresponding curve obtained (Part I) with equal pro- 

 portions of lead and zinc in the original mixtures at near 650 ; in 

 each case the abscissae are the percentages of tin in the heavier alloys, 

 whilst the ordinates are the excesses of the tin percentages in the 

 lighter alloys over the corresponding percentages in the heavier ones. 

 On the other hand, on plotting the curves representing the solu- 

 bility of zinc in bismuth-tin (percentages of tin in heavier alloys as 

 abscissae, and those of zinc as ordinates), and of bismuth in zinc-tin 

 (percentages of tin in lighter alloys as abscissae, and those of bismuth 

 as ordinates), it is obvious that the solubility increases in each case 





