44: Rankin and Wright — Ternary System CaO-Al^O-Si0 2 . 



THE VARIOUS BINARY SYSTEMS WITHIN THE TERNARY SYSTEM. 



These relationships may be ascertained from a study of the 

 diagram tig. 12. In this diagram are drawn, besides the 

 boundary curves, straight lines connecting the compositions of 

 each pair of compounds whose fields have a common boundary 



Fig. 12. 



3CaOESi0 2 , 



2CaO.Si0 2 . 



nA! 2 3 Si0 2 



3CaO.SiQ,a 



\ 



.2Ca0.AI 2 0jSiqJ 



^CaO.SiOj 



3CaO.AI 2 3 5Ca0.3AI 2 3 CaO.AI 2 3 3Ca0.5AI 2 3 



Fig. 12. Diagram of the ternary system showing the various binary 

 systems within ternary system. 



curve ; each of these straight lines, which represents all possi- 

 ble mixtures of the two compounds whose compositions it con- 

 nects, is a horizontal projection of the melting curve of these 

 mixtures in solutions of themselves. From a glance at the dia- 

 gram it will be seen that while (a) certain of the straight lines, 

 drawn as full lines, lie entirely within the fields of the two 



