330 THE EARL OF BERKELEY, MESSRS. E. G. J. HARTLEY AND J. STEPHENSON 



hoped that any contamination from the atmosphere would affect both equally, and by 

 determining the resistances of the water and solution in the following order water, 

 solution, water, solution, water and taking the mean values, we should thus get a 

 close approximation to the conductivity of the salt in the cell. 



Bobber 

 plug- 



Stirrer 



Mercury 



Fig. 2. 



Using Kohlransch's* value for the conductivity of N/1000 potassium chloride 

 (reduced to C. by means of D^OUISNE'S temperature coefficientf) and correcting it 

 for the slight difference in concentration between N/1000 and our solution, we get the 

 resistance capacity of the cell = 0'4539 ohms. 



Resistance of the very Dilute Solutions. 



A stock solution of each salt was made up and this was used as in the case of the 

 standard potassium solution ; it was found, however, that all of the very dilute 



* LANDOLT and BORNSTEIN'S tables, 1905, p. 756. 

 t LANDOLT and BORNSTEIN'S tables, 1905, p. 755. 



