254 WIEDEMANN ON THE MOTION OF LIQUIDS 



§11. 



The results of observation given in the foregoing paragraphs 

 satisfactorily prove how nearly the mechanical action of a gal- 

 vanic current conforms to all conditions which modify its general 

 deportment. 



Let us next represent by m the quantity of liquid transported 

 by a galvanic current of the intensity i, through a porous parti- 

 tion of the thickness d and surface o ; then, according to § 4-6, 



where X: is a constant magnitude for every liquid, whose value 

 changes, however, according to the nature of the different liquids 

 employed (the friction in the pores of the porous partitions, and 

 their resistances to galvanic conduction), and is also dependent 

 upon the different densities of the partitions. Hence the quan- 

 tity of a certain liquid, transported by a galvanic current of 

 given intensity through a porous partition iri the unit of time, is 

 directly proportional to the intensity of that current, and inde- 

 pendent of the thickness and transverse sectional area or surface 

 of the porous partition. 



Further, let us represent by h the height attained when em- 

 ploying the manometer ; by r, the specific resistance of the 

 liquid used, then 



, i,r,d 

 h^c , 







where c is a constant. 



The force with which a galvanic current forces any liquid in- 

 troduced into its circuit from the positive towards the negative 

 electrode, through a partition presenting a given surface, may be 

 measured by a pressure directly proportional to the intensity of 

 the current, to the specific resistance of the liquid and to the thick- 

 ness of the partition, but inversely proportional to the permeable 

 surface presented by that partition. 



Although these laws include the sum of all the observed phae- 

 nomena, and in each special case allow comparisons to be in- 

 stituted between the results obtained in moving liquids by the 

 galvanic current, and the other manifestations of the current's 

 activity, such as for instance its chemical or calorific action, yet 

 they do not furnish any correct insight into the inner nature of 



