1891.] 



On certain Ternary Alloys. 



165 



same peculiarities as the corresponding series obtained with lead, zinc, 

 and silver described in Part II ; thus the silver-distribution curve is 

 of sensibly the same character, the excess of silver in the lighter 

 alloy over that in the heavier being at first extremely great, but later 

 on lessening, until a maximum elevation of the curve above the base 

 line is attained, after which the curve again descends. Curve No. 1, 

 fig. 4, indicates this, No. 2 being the corresponding curve from the 



FIG. 4. 



lead-zinc-silver alloys (Part II), the abscissae in each being the per- 

 centages of silver in the lighter alloys, and the ordinates the ex- 

 cesses of silver percentage in the lighter alloys over those in the 

 heavier ones. Similarly, the curve traced out by plotting the silver 

 and bismuth percentages in the lighter alloys as abscissae and ordinates 

 respectively (No. 1, fig. 5) exhibits the same feature of rapid rise to a 

 maximum, subsequent fall to a minimum but little above the starting 

 level, and later continuous rise. The position of the first maximum, 

 moreover, is close to that indicating the relationship AgZn 5 , just as 

 with the former alloys. 



Silver. Zinc. Ratio of zinc to silver. 



22-36 64-25 1 to 0-348 



Calculated for AgZn 5 1 to 0'332 



