INDUCTANCE AND CAPACITY 



383 



On trying the experiment it will be found that unless the rela- 

 tion (B) is approximately fulfilled the needle will be slightly 

 disturbed. 



In the following proofs, except in those for De Sauty's method 

 for comparing capacities where the application of both condi- 

 tions for balance will be illustrated, the condition i o = con- 

 tinuously will be imposed. 



De Sauty Method for Comparing Capacities. This method is 

 adapted to the comparison of condensers without leakage, which 

 are either free from absorption or have equal rates of absorption. 

 Fig. 224 shows the connections. 



FIG. 224. Connections for De Sauty method for comparing capacities. 



The two bridge arms R M and R N are non-inductive resistances. 

 C x and C P are the two condensers which are to be compared. 

 The detector, which will be considered as having both inductance 

 and resistance, is at G. 



When the key K is against the back stop the condensers are 

 discharged. The arms R M and R N are adjusted until on depress- 

 ing K the detector gives no indication. Then 



To prove this relation, condition 1 (page 381), will first be applied. 

 In that case, the variable current i M is that flowing into condenser 

 C* and the variable current i N is that flowing into C P , and at 

 every instant 



