( 468 ) 



screen was larger than the first, tlien, the side of the former, facing 

 the anode, was coppered for a part about as large as the latter. 



Then, the experiment was repeated with a screen, dividing the 

 basin into two equal parts, but having a small hole in the middle. 

 Just as a part of the stream-lines in some of tlie lurmor experiments 

 went round the screen, so here a very great contraction of the stream- 

 lines towarrds the hole may be expected. Some of them will deviate 

 from their straight way preferring the way through the hole, to 

 the way through the screen. This is (-(mliniKMl by a circular part of 

 the screen remaining uncovered. 



The following data are the results of a series of experiments, taken 

 with holes of different size. 



distance between electrodes 3 cm., diameter of electrodes 19 mm. 



If the smaller screen is taken, so that stream-lines can also go 

 round it as well, then the uncovered part is considerably smaller. 

 The diameter of it was 3 mm. at a 1 mm. diameter of the hole. 



It is worth notice, that, while the electro-motive force remained 

 the same, the current-intensity increased on increasing tlie diameter 

 of the aperture. If for instance at the experiment with the smallest 

 hole (diam. 1 mm.) the intensity after the beginning of the j^olari- 

 sation was 0,1 amp., it amounts under the same circumstances to 

 0,3 amp., when using the screen with the biggest hole. 



It is curious, that at the first experiment a copper-deposit was 

 seen on the case of brass gauze surrounding the kathode, though 

 properly it is nothing but a screen with a great number of small 

 holes. According to what is said i)efore, it might have been expected, 

 that all the stream-lines would pass from ti:e anode thiongh the holes 

 of the case to the kathode and therefore not form any deposit on 

 the gauze. In connection with this, some more experiments were 

 taken with different sorts of brass gauze, but already by using the 

 next size — stitches of 2 mm' and 0,3 mm. wires — no traces 

 of copper were precipitated. 



If the way through the fluid was made considerably longer, 

 then, in some cases, the current still seemed to prefer this i-ound- 



