OF THALLIUM, INDIUM, AND TIN 



The values of the densities of the pure metals used for this calculation are 

 given in the first column of the table. The value for the density of pure 

 indium is the mean of two closely agreeing determinations made by us 

 with Professor Dennis's pure sample of the metal, because the values 

 previously obtained, 7.421 by Winkler and 7.12 by Thiel, are in very poor 

 agreement. Our data are as follows : 



First Determination : 



Weight of pycnometer : Grams. 



With air-free water (20.0 ) 10.1338 



Alone 7.0012 



With indium alone 10.2568 



With indium and water 12.9420 



Result : Density 7.277 



Second Determination: 

 Weight of pycnometer : 



With indium alone 10.0045 



With indium and water 12.7525 



Result : Density 7.291 



The mean value is 7.284. Corrected to vacuum the true density of 

 indium is found to be 7.277. 



TABLE i. Densities of Amalgams. 



The density curves for the thallium, indium, and tin amalgams are 

 shown in fig, 3. The dotted lines give the imaginary values that would 

 be obtained if neither expansion nor contraction took place on mixing. 

 Indium and tin contract on amalgamation, while in the case of thallium 

 there is a slight expansion. 



