1894.] 



On some Phenomena in Vacuum-tubes. 



237 



tube, a distinct bright band is seen on each side of each glass disk. 

 Several tubes are used in this experiment, and in many instances by 

 lowering the current the time arrives when the two bright bands, on 

 either side of a disk, appear as one. When the current is increased 

 these bands leave the edges of the disks to some distance from them, 

 as if they are repelled one from the other in consequence of more 

 current flowing through the tubes and creating a greater electrifica- 

 tion, if it be due to this cause at all. 



It is further seen that throughout the free portion of tubes con- 



Fia. 3. 



FIG. SA. 



FIG. 3s. 



JL 



