242 



WIEDEMANN ON THE MOTION OF LIQUIDS 



laid with a non-conducting stratum of wax or shell-lac varnish, 

 impervious to the liquid employed, and then applied as 

 before. 



The following are the mean results of many experiments. In 

 each case the relation between the intensity i of the galvanic 

 current and the corresponding quantity m of transported liquid 

 is given. 



m 

 % 



1-23 

 1-22 

 1-24 

 1-10 

 1-11 



II. Solution of Sulphate of Copper (19*1 parts Cu S + 5 aq to 

 100 parts of solution). 



With the whole surface of the clay cylinder 



f of the 



99 y 



1 



99 ■? 



99 

 99 



T? 99 



m 



m 



i 

 2-30 

 231 

 2-35 

 2-28 

 2-31 



From a comparison of the quotients — , it is evident that they 



remain almost constant even when the permeable surface of the 

 clay cylinder is materially diminished, so that to the above law, 

 expressing the dependence of the quantity of transported liquid 

 on the intensity of the acting current, may be added, — 



TTie quantities of liquid transported by a galvanic current in 

 equal times through different porous partitions are independent 

 of the magnitude of permeable surface which these partitions 

 present. 



The effects of a galvanic current remain equal, under equal 

 conditions, throughout its whole length. If, therefore, in a 

 liquid placed between the electrodes, two equal porous (clay) 



