

and the Weston Normal Cell. 



273 





Table XI. 





Amalgam cell no. (1). Hot limb 4-. 

 E.M.F.'s at various temperatures. 



Mercury cell no. (4). Hot limb 4-. 

 E.M.F.'s at various temperatures. 



Cold limb. 



Hot limb. 





Cold limb. 



Hot limb. 





0° 



0° 



0-00000 v. 



0° 



0° 



000000 v. 



0° 



5° 



144 



0° 



5° 



145 



0° 



10° 



297 



0° 



1C° 



291 



0° 



15° 



459 



0° 



15° 



440 



0° 



20° 



630 



0° 



20° 



593 



0° 



25° 



809 



0° 



25° 



750 



0° 



30° 



996 



0° 



30° 



907 



Comparison of Results, 



A comparison of some of our results with those of other 

 observers is of interest. 



Jaeger made measurements on various amaloams at about 

 20° C. 2 and at this temperature, cells containing amalgams 

 with from about 5 to 14 per cent, of cadmium were found to 

 give nearly identical results. A 20 per cent, amalgam cell 

 gradually increased in E.M.F. until the latter was 11*5 milli- 

 volts greater than the E.M.F. of normal cells. This difference 

 is not far removed from the difference 12*5 millivolts for the 

 20 per cent, chilled amalgam (Table VIII.), and the difference 

 10'4 millivolts for the slowly cooled amalgam (Table II.). 

 Jaeger made no observations at 0° C. 



Bijl's 6 experiments on the electromotive properties of 

 cadmium amalgams were made at 20°, 25°, 50° and 75°. 

 From the published results it appears that at 25° amalgams 

 containing from about 5*8 per cent. ( = 9*9 atomic per cent.) 

 to 15*7 per cent. ( = 25 atomic per cent.) of cadmium possess 

 the two-phase system. From fig. 4 it will be seen that our 

 own experiments fix the limits at 25° as 5*6 and 14 per cent- 

 The lower limits may be taken as identical. 



At 50° we conclude from curves given by Bijl that the 

 limits are about 9*9 per cent. (16*4 atomic per cent.) and 

 20 per cent. (30*8 atomic per cent.) of cadmium, whereas 

 fig. 4 of this paper gives the limits at 50° as 9*7 per cent, and 

 17*7 per cent. Again the lower limits may be taken as 



Phil. Mag. S. 6. Vol. 19. No. 110. Feb. 1910. T 



