Transactions . g-nificance. This principle may be extended to ternary mixtures.*Now, slag formation-temperatures are believed to differ butlittle from freezing- (or melting-) points. It seems not toogreat a stretch of imagination to think that a maximum of * Solid Solutions of Mixtures of Three Substances. G. Bruni, Atti E. Ac-cad, dei Lined, Home, ix., [5], 232-241; Chem. Centralbl. (1900) ii., [23], 1173:Jour. Soc. Chem. Ind. (1901), xx., [2], 160. Fig. a—Formation-Temperatures of fflagu (Plotted (ran Prof. HoW,Paper, Zront., xxix., 682). A CaO ; B = SiO,
Transactions . g-nificance. This principle may be extended to ternary mixtures.*Now, slag formation-temperatures are believed to differ butlittle from freezing- (or melting-) points. It seems not toogreat a stretch of imagination to think that a maximum of * Solid Solutions of Mixtures of Three Substances. G. Bruni, Atti E. Ac-cad, dei Lined, Home, ix., [5], 232-241; Chem. Centralbl. (1900) ii., [23], 1173:Jour. Soc. Chem. Ind. (1901), xx., [2], 160. Fig. a—Formation-Temperatures of fflagu (Plotted (ran Prof. HoW,Paper, Zront., xxix., 682). A CaO ; B = SiO,; 0 = 100 FeO. C, Position of basal slag ( SiO,,; FeO ; CaO). K, Maximum : CaO,(FeO)„S10, ( and respectively).L, Maximum : (FeO)2,Si02 ( and respectively),T, Z, Possible maxima: CaO,SiO, and CaO,(FeO ,.M, S, Minima. N, K, Possible , Basic , Acid slags. KZOL, Free-FeO slags. Note.—The numbers printed in tbe diagram indicate degrees Q #or 91 LG-00N8TIT1 HON, - I I Ill I Bl I i;l-.\\l \i. DJ \..i: \\i. formation-temperature in slag-mixturee corresponds to theexistence of a definite chemical compound at that point andtemperature, and that all proportions not giving maxima imechanical mixtures. This would seem to indicate that in thewhole range of Prof. Hofmans work there are 1»«11 two pro-portions giving definite chemical compounds, namely (FeO ,Si02, the formation-temperature I. of which is L270 C, andCaO, FeO ,SiO„ the formation-temperature K of whichl-_v> (. It would be desirable to study how much heat isliberated or absorbed in forming these compounds; for if theamount be at all considerable, it will have an important bear-ing on fuel-consumption.* It* a line be drawn on the diagram, Fig. 6, through thetwo maxima L and K. and continued, it will pass exactlythrough the vertex A. of the diagram, representing 100 will further be noticed that all the isotherms intersected byit make angl
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