( 467 ) 



anode was hung in a plalinmn cup, wliicli jiiiist re[>laco llie platinum 

 diaj>liragin and was llicrefore partly tilled with tlio oloctrolyte. 

 Directly the circuit was close<l, the inside of the cup was evenly 

 coppei-ed, as high as the surfiice of the licpiid, while at the outside 

 an intense gas-development took place, which was soon impossible 

 to be observed well, as on account of the polarisation the current- 

 intensity was considerably decreasing. In some cases from 0,1) amp. 

 to 0,02 amp. If on the reverse the kathode was hung in the 

 cup, the development of gas took place at the whole inside. Half 

 of the outside of the cup facing the anode was partly and unevenly 

 covered with a copper-deposit. 



When making the experiment with a sheet of platinum (5 X ^ <'"i)» 

 dividing the glass in two equal parts, the results were just the 

 same. Here also the platinum was entirely covered with precipitated 

 copper. At a distance of the electrodes of about 10 m.m., the copper- 

 deposit was pretty evenly spread over the platinum. At a smaller 

 distance of the electrodes (4 m.m.) there came between the electrodes 

 on the platinum a distinct circular deposit, while the copper precipit- 

 ated on the remainder of the screen was very faint. A same deposit 

 perfectly corresponds with the sections of the stream-lines we should 

 expect. 



The same results were obtained, when using two diaphragms 

 dividing the cup into three parts. At the first experiment two dia- 

 phragms were used, completely shutting off the fluid and connected 

 with a copper-wire. The side of the first diaphragm, facing the anode, 

 counting from the anode to the kathode, was entirely coppered; the 

 side of the other one, facing the kathode, was covered with gas-bubbles. 



At a second experiment only the connecting wire was taken 

 away. The sides of both diaphragms, facing the positive electrode, 

 were entirely covered with a copper-deposit. On the othei- sides gas 

 was developing. 



At a third experiment two platinum screens (4X4 cm.) were 

 used, thus not shutting olf the iluid com|)letcly, but connected, 

 however, with a coj)|>er-wire. The same circular co|)per-deposit 

 came on the first screen, facing the anode, but, when breaking the 

 connection the same side of the second screen was, on the contrary, 

 entirely covered with copper. 



The latter phenomenon can be explained in this manner: The 

 copper-ions, leaving the anode, yielded their charge to the first screen, 

 over which it is entirely distributed "and which, over the whole side, 

 facing the kathode, serves in its turn as anode tfjwards the second 

 screen, which is coppered over the whole surface. If the second 



31* 



