

! 2 I 



THE 



AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] 



Art. L— The Ternary System CaO-Al,0,-SiO,; by G. A. 

 Rankin. With Optical Study by Feed. E. Weight. 



Con-tents. 

 Introduction. 

 Review of the Binary Systems. 



Lime-Silica System. 



Alumina-Silica System. 



Lime-Alumina System. 



Phase Rule and its Application to Ternary Systems. 

 Application to the System Lime- Alumina- Silica. 

 Typical Three-Component Systems. 



Experimental Methods. 

 Experimental Investigation. 



General Relations of Binary Compounds in Ternary Mixtures. 

 The Ternary Compounds. 

 The Stability Fields. 

 The Boundary Curves. 

 The Quintuple Points. 

 Eutectics. 

 Quintuple points not eutectics. 



Recapitulation ; The Concentration-Temperature Model. 

 Some General Considerations. 



The Various Binary Systems within the Ternary System. 



Crystallization in Ternary Systems. 



Application of the Equilibrium Diagram to Problems Involving 

 the Three Oxides : 



To Portland Cement Clinker. 

 To Certain Geological Inquiries. 



Summary. 



Introduction. 



It is a matter of interest to ascertain the stability relations 

 in the ternary system CaO-Al 2 3 -Si0 2 , not only from a purely 

 scientific point of view, but also from the bearing of the facts 



Am. Jour. Sci. — Fourth Series, Vol. XXXIX, No. 229.— January, 1915. 



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