110 



The cell was made as in Fig. I, the electrodes being made of cad- 

 mium amalgam. By placing the two ends in water baths the two ends 

 can be kept at a constant small difference of temperature, thus keeping 

 the e. m. f. constant. The following data and curve (Fis>\ II) are for a 

 cell filled with 10 per cent, solution of cadmium sulphate. 



Length of cell .... 99 cm. 



Cross section 277 sq. cm. 



1 



From curve Re -\- Rg == 17470 ohms. 

 Rg = 225. 



Sp. Resistance p = 



17470 X -277 

 99. 



48.3 ohms. 



