486 OHM ox THE GALVANIC CIRCUIT. 



1 1 1 1 o 



A = X + ¥+7J^ + ^^- 

 From the preceding explanations we may conclude, that 

 when A denotes the sum of all the tensions, and L the entire 

 reduced length of the circuit without adjacent conductors, the 

 magnitude of the current, while the adjacent conductors are in 

 connexion with the circuit, will be expressed in the circuit itself 



by 



A 



L + A' 



in the joint conductor, whose reduced length is X, by 



A A 



L + A • X' 



in the joint conductor, whose reduced length is A.', by 



A A 

 L + A • A' ' 



in the joint conductor, whose reduced length is x", by 



A A 



L + A ■ A" ' 

 and so on, where for A its value obtained from the equation 



1 1 1 1 o 



A = T + ^ + X" + ^^- I 



has to be placed. | 



29. That in the above the galvanic current is found to be of I 



equal magnitude at all places of the circuit, arises from the 



(i lit 

 value of -j—, deduced from the equation 



being constant. This circumstance no longer happens if we 

 start fi'om the equations given in § 22 and 23. In all these 



cases -1— is dependent on x, which indicates that the magnitude l 



of the current is different at different places of the circuit. We 

 may hence di-aw the conclusion, that the electric current is only 

 of equal intensity at all places of the circuit, when the circuit 

 has already assumed a permanent state, and the atmosphere 

 has no sensible action upon it. This property hkewise appears 

 best adapted to enable us to find out, by experiment, whether 



