1 894.] establishment of Difference of Potential, 



FTG. 2. 



255 



The ground was much drier than was the case in the first experi- 

 ment, and, probably in consequence of this, it appears that while the 

 statical P.D. between the two first weights is relatively greater in 

 the second than in the first experiment, the P.D. obtained with a 

 current-using instrument is relatively less. 



The statical P.D.'s to be observed extended rather beyond the 

 rauge of one voltmeter. Thus, between weights A and B no statical 



