260 



MEASUREMENT OF CURRENTS. 



branches indicated by these same letters; g l that of the galvano- 

 meter with its shunt ; I the intensity of the current in the branch a; 

 and Ij the intensity of the current in the branch ^, we have 



1= (I -I 



n> + + 



L 



The resistance a is then replaced by another very different one a', 

 and a corresponding resistance V is placed in the branch , such 



jPQQOQOOOOO 



Fig. 168. 



that the current in the galvanometer does not alter, the condition 

 follows 



^ + ^ (p+al ^ + ^ +gl+y , 



which gives 



