1894.] On certain Ternary Alloys. 131 



temperature does not exceed 700 to 750. At temperatures of 800 

 and upwards, however, so much cadmium vapour is given off from 

 the heavier alloy (in which cadmium predominates) as seriously to 

 interfere with the experiment, not only because of the alteration in 

 composition thereby produced, but also because of the intermixing 

 effect tending to prevent proper separation by gravitation of the 

 lighter and heavier alloys from one another. 





 Binary Alloys of Aluminium and Cadmium. 



A series of observations was first made to determine the composition 

 of the binary alloys formed when aluminium and cadmium are 

 melted together and well stirred, and then allowed to stand at a 

 temperature of 700 750 (averaging about 725) for several hours. 

 The following figures resulted as the averages from twelve tolerably 

 concordant experiments : 



Heavier alloy. Lighter alloy. 



Cadmium 9978 339 



Aluminium . . 0'22 96'61 



100-00 100-00 



Hence the solubility of cadmium in aluminium, like that of lead 

 and of bismuth in the same metal, is but small ; whilst the solubility 

 of aluminium in cadmium, like that in lead or bismuth, is incon- 

 siderable, thus 



Temperature. Solvent. Percentage. 



800 C Lead Aluminium = 0'07 



870' Bismuth ... = 0'28 



725 . . Cadmium . = 0'22 



Mixtures of Aluminium, Cadmium, and Tin. 



The alloys were prepared by melting the aluminium, then adding 

 the tin, and finally the cadmium, well stirring as soon as the latter 

 was fluid, pouring quickly into the red-hot clay test-tubes, and main- 

 taining these at 700 750 (averaging about 725) for from six to 

 eight hours in the lead bath. The analysis was made by dissolving in 

 hydrochloric acid solution containing nitric acid, diluting and pre- 

 cipitating with sulphuretted hydrogen, and separating the tin and 

 cadmium sulphides by means of ammonium sulphide, the tin being 



