130 Dr. C. R. Alder Wright. [Feb. 



February 15, 1894. 



Sir JOHN EVANS, K.C.B., D.C.L., LL.D., Vice-President and 

 Treasurer, in the Chair. 



A List of the Presents received was laid on the table, and tl 

 ordered for them. 



The following Papers were read : 



I. "On Certain Ternary Alloys. Part VIIL Alloys coi 

 taining Aluminium, Cadmium, and Tin ; Aluminium, Anl 

 mony, and Lead ; or Aluminium, Antimony, and Biemutl 

 By C. R. ALDER WRIGHT, D.Sc.,. F.R.S., Lecturer 

 Chemistry and Physics in St. Mary's Hospital Medic 

 School. Received January 8, 1894. 



In Part VII* it has been shown that whilst cadminm can act 

 " solvent " metal towards either of the immiscible pairs lead at 

 zinc, bismuth and zinc this is not the case when aluminium is si 

 stituted for zinc, because cadmium and aluminium (contrary to 

 usual statements in the text-books) are not miscible in all prof 

 tions, unlike cadmium and zinc. Accordingly, it becomes of intei 

 to examine the behaviour of ternary metallic mixtures whe 

 cadmium and aluminium are the two immiscible metals, more espe 

 ally when a "solvent" metal is employed also capable of use 

 similar fashion with the immiscible pairs, aluminium and lea 

 aluminium and bismuth, so as to trace out the effect of substitutii 

 cadmium for lead or bismuth. Such a solvent metal is tin; 

 volatility of cadmium, however, precludes the possibility of employing 

 elevated temperatures above the boiling point of that metal (about 

 770 C.) ; but, thanks to the physical attraction of molten aluminium 

 for cadmium (comparable with that of water for gaseous hydrochloric 

 acid), it is possible to keep molten in long narrow crucibles metallic 

 mixtures containing simultaneously aluminium and cadmium, with- 

 out any material amount of volatilisation of the latter metal takii 

 place from the surface of the lighter alloy that floats up (of whic 

 aluminium necessarily constitutes the majority), so long as tl 



Part I, ' Boy. Soc. Proc.,' vol. 45, p. 4G1 ; Part II, TO!. 48, p. 25 ; Part 

 vol. 49, p. 156; Part IV, vol. 49, p. 174; Part V, TO!. 50, p. 372; Part VI, vol. 

 p. 11 ; Part VII, vol. 62, p. 530. 



