252 WIEDEMANN ON THE MOTION OP LIQUIDS 



4 = 0*73, giving a value of ^ between 0-43 and 0*36, in fact 

 exactly the same as before. 



§10. 



Lastly, the author attempted to investigate yet more accu- 

 rately the relation between the transferring power of the gal- 

 vanic current and the nature of the several liquids transferred. 

 On account of the different degrees of friction in the pores of 

 the clay partition, a satisfactory answer to questions connected 

 with the above relation could not be expected from mere mea- 

 surements of the quantities of the different liquids which equal 

 currents could transport in equal times. The method last em- 

 ployed, however, promised more satisfactory results, inasmuch 

 as the influence of friction is thereby eliminated. As it was 

 before proved that the conductibility of the liquids had an 

 essential influence upon their transference, the chief object in 

 the following experiments was to examine whether or not a 

 more accurate relation could be established betw^een the heights 

 of the mercury in the manometer of the apparatus described in 

 § 7> caused by currents of equal intensity passing through dif- 

 ferent liquids, and the relative resistances which these liquids 

 opposed to the conduction of the current. 



In the absence of sufficient data showing the galvanic con- 

 ductibility of liquids, particularly of such where liquids of 

 different resisting capabilities are compared with each other, 

 it was necessary to make a few preliminary experiments, in 

 order to determine, if not very accurately, at least with an 

 accuracy sufficient for the object in hand, the relative resist- 

 ances opposed by several solutions of copper of different degrees 

 of concentration. 



The method according to which these determinations were 

 made, was throughout the same as the one adopted by Becker 

 and described in his memoir on the subject*. The liquids were 

 placed in a rectangular glass trough about 45 millims. long, 

 45 millims. broad, and 80 millims. high, whose two end surfaces 

 were covered in the interior by copper plates cemented thereon ; 

 the trough was always filled to the brim with the liquid to be 



* Liebig's Annalen, Bd. Ixxiii. s. 1. 



