Dr. C. R. Alder Wright. 



FIG. 2. 



Sb. 



192. 



\ N 



V 



Ft. 



At 



Fig. 2 represents these values depicted graphically on the tri- 

 angular system, the outer dotted line, No. 1, being the carve obtained 

 with aluminium-lead-tin alloys at about 800 (Part VI), and the 

 inner dotted line that for zinc-lead-antimony alloys at 800 (Part 

 VII). Obviously, the first five tie-lines belong to a perfectly regular 

 curve, which, by analogy with the other two dotted carves, might be 

 expected to follow approximately the course indicated by the middle 

 dotted line No. 3 ; so that the tie-lines 8, 9, and 10 doubtless represent 

 simply the effect of the separation of solid aluminium antimonide 

 from what would otherwise be a " real " alloy, this action probably 

 taking place partly during the period of tranquil fusion, and partly 

 daring the short time requisite to cool down the resulting compound 

 ingot. In the case of tie-lines 6 and 7, the mixtures of metals used 

 appear to have corresponded with ideal alloys, and the heavier alloys 

 that were obtained did not widely differ from such as would 

 expressed by points on the normal critical curve ; but this was 

 the case with the lighter alloys, where the quantities of aluminii 



