IN A CLOSED GALVANIC CIRCUIT. 24? 



liquid as the galvanic current would transport into it. If, in 

 this manner, the height attained by the mercury in the mano- 

 meter be observed in the several experiments, the results thus 

 obtained will be independent of the influence of the friction 

 of the liquids in the pores of the clay cylinder, inasmuch as now, 

 in place of motion, a purely statical condition is produced. 



In such experiments it is necessary to avoid every kind of 

 liberation of gas within the clay cylinder ; for were such to 

 occur, the level of the mercury in the manometer would be 

 thereby affected. This inconvenience was avoided by employ- 

 ing copper electrodes and differently strong solutions of sul- 

 phate of copper. Thus also a greater constancy of galvanic 

 current was ensured, inasmuch as the phaenomena of polarization 

 were avoided. 



§8. 



Repeating the same experiment under equal conditions until 

 a satisfactory agreement in the results had manifested itself, the 

 relation between the intensity of the galvanic current and the 

 heights attained by the mercury in the manometer under other- 

 wise equal circumstances, was ascertained. The results of some 

 of the observations may be seen in the following tables, i de- 

 notes, as before, the intensity of the current ; h the correspond- 

 ing height of mercury in the manometer; — the ratio of the two. 



I. Solution of Sulphate of Copper (19 parts CuS-f 5 aq to 

 100 parts of solution). 



