222 



Dr. T. Kirke Hose. On certain 



[Feb. 9, 



alloys was determined by the Volhard process of assay. Cooling 

 curves were taken of the alloys by means of a Le Chatelier thermo- 

 couple and the recording pyrometer described by Koberts-Austen* and 

 the following results were obtained : 



Freezing-points of the Silver-Cadmium Alloys. 



Percentage of silver Atomic percentage 



by weight. 



lOO'O 



95-01 



92-63 



92-57 



88-80 



87-20 



84-59 



83-34 



79-94 



74-98 



66-10 



63-83 



57-74 



54-39 



51-39 



49-36 



41-68 



39-85 



30-11 



29-52 



21-12 



9-12 



1-20 



0-60 



o-o 



The temperatures in brackets denote subsidiary freezing points which 

 are generally below but sometimes above the main freezing points. 



The curve of equilibrium between liquids and solids of the series is 

 given in fig. 2. It has been plotted from the results given in the table. 

 The upper continuous line is the liquidus curve. The solidus curve, 

 which is not complete, is represented by the lower line, and is based 

 on a study of the cooling curves, and of the micro-structure of chilled 

 specimens. 



When alloys containing more than 80 per cent, of silver! are 



* 'Inst. Mech. Eng. Proc.,' Oct., 1891, p. 543. 



t Both here and subsequently "per cent." is used for " miinber of atoms per 

 cent." It happens, however, that this is nearly the game as the percentage by 

 weight, the atomic weights of silver and cadmium differing but little. 



