Rankin and Wright — Ternary System OaO-AL0 3 -Si0 2 . 43 



Some General Considerations on the System CaO- 

 AL a O,-SiO a . 



In what precedes we have taken up the various points, 

 curves and regions separately ; we shall now proceed to discuss 



Fig. 11. 





jE| I s o I ||BBH| m 





^fSJj^r . ^B 



«G9r 





ICftO^H 





Fig. 11. Photograph of solid model taken from directly above, showing 

 relation of various fields. 



some of the more general relationships. For convenience in 

 these discussions each component will be designated by its first 

 letter, thus— = CaO ; A = Al a 3 ; S = SiO,. This simpli- 

 fies the designation of compounds thus — 08 = CaO. SiO, ; 

 CAS, = CaO.Al,0 3 .2SiO, ; 3 A 6 = 3Ca0.5Al,0 3 ; etc. 



