1889.] On certain Ternary Alloys. 



Series III. Lead- bath. Temperature near 646. 



473 



On plotting these numbers as before, it is at once evident that the 

 carves thence obtained differ but little from those obtained in Series 

 I and II, excepting in being more regular, what differences exist being 

 such as are obviously due to the more nearly complete separation now 

 obtained in all cases ; whence it may reasonably be inferred that the 

 conclusion previously arrived at is correct, viz., that a variation in 

 temperature between 565 and 689 makes practically no difference in 

 the way in which a given mass of metal divides itself on standing 

 molten. This conclusion is corroborated by the results described 

 below, obtained with two other series of mixtures containing lead and 

 zinc in the proportion 1 to 2, in the first of which a mean temperature 

 close to 650 was employed, and in the second a temperature about 

 100 higher; the curves deduced from the two series respectively 

 differing from one another only by amounts barely, if at all, outside 

 the limits of experimental error. 



Experiments ivith Lead and Zinc in Unequal Proportions. 



We next made several series of observations with lead and zinc in 

 unequal proportions and varying quantities of tin, with the object of 

 finding out how far the distribution of tin between the two resulting 

 alloys is influenced by the relative masses of metals present. If the 

 alloys formed when completely separated from one another are re- 

 spectively saturated solution of zinc in lead containing tin (bottom) 

 and saturated solution of lead in zinc containing tin (top), it should 

 result that the two first curves obtained as above described will be the 



2 i 2 



