COMPARISON OF CAPACITIES WITH RESISTANCES. 



473 



condenser, the capacity is then replaced by a resistance R 1? which 

 re-establishes equilibrium, and satisfies the equation 



The value of the resistance R 2 , of the network between the 



points B and C is 



and the capacity is given by the condition that 



1062. Professor J. J. Thomson* has applied this method, which 

 was first suggested by Maxwell,! by introducing into the experiments 

 a modification which permits the use of a vibrating plate. 



One of the armatures of the condenser is connected with the 

 summit C of the bridge, and the other with a plate L which oscil- 

 lates between the contacts P and N (Fig. 225). The condenser 

 discharges itself, and its charge alone interposes in the general 

 current. For n double oscillations per second, the mean intensity 



* J. J. THOMSON. Transactions Roy. Soc. for 1883. 



t MAXWELL. Electricity and Magnetism, Vol. n., p. 375. 



