102 



Dr. G. Gore on the Relation of Volta 



In every case of production of current, provided the two 

 electrodes were neutral whilst in the horizontal position, and 

 were allowed to remain sufficiently long in each of the vertical 

 ones, the two opposite currents produced were equal in 

 amount. In all the cases in which a sudden change from 

 the horizontal position (and a neutral state) to the vertical 

 one was attended by production of a current, the maximum 

 amount of deflexion of the needles usually occurred in about 

 three minutes ; but if in any case, whilst the tube was vertical, 

 its ends were suddenly reversed, the reversal of the deflexion 

 required a longer period of time to attain its maximum. 



Degree of Permanence of the Currents. 



With the object of ascertaining whether the currents were 

 temporary or permanent, two of the tubes were fitted with 

 zinc electrodes and a solution of NaC10 3 of the usual strength 

 (see exp. 39) made with distilled water, which had been 

 deprived of air by boiling. After having become neutral in 

 the horizontal position, they were placed vertical and gave 

 the following results : — 



Table IV. 

 Influence of Time. 



Number of 

 experiment. 



Minutes. 



Deflexions. 



Minutes. 



Deflexions. 



Minutes. 



Deflexions. 



( 



92. 

 \ 



1st. 

 2nd. 

 3rd. 

 4th. 

 5th. 



10 | 

 20 „ 

 25 „ 

 30 „ 



10th. 

 15th. 

 30th. 

 45th. 

 60th. 



30 f 



25 „ 



75th. 



90th. 



105th. 



120th. 



16 hours. 



30 f 

 20 „ 



By subsequently placing the tubes horizontal to become 

 neutral, and then erecting them again, the deflexion was 25° f . 

 The results show that the action was of a comparatively per- 

 manent character, and that the currents were not due to 

 dissolved air. 



Influence of Strength of Solution. 



In this case zinc electrodes and two solutions of the same 

 substance of different degrees of concentration were employed. 





