244 



Sir David Salomons, Bart. 



[June 21, 



cases screens across the tubes with holes in them, and other tubes 

 similar to those already described, the object being to see whether 

 the effects produced are the same as if the tubes had been straight, 

 and this proved to be the case. One tube is shown in fig. 7. 



Experiment 8. 



This one consists of a number of tubes containing no devices of 

 any kind. But in one case there are two electrodes at one end, and 

 one electrode at the other end of the tube. In another case a tube 

 has two electrodes at each end. Another tube has very small elec- 

 trodes, while others have various sizes of electrodes. In all these 

 instances bands are produced, but the smaller the electrodes the less 

 current has to be passed to show the bands, and the closer they 

 appear together. (See figs. 8 and SA.) 



Fio. 8. FIG. SA. 



Experiment 9. 



A plain tube (see fig. 9) has placed at the ends cap electrodes, 

 about 16 mm. in diameter, close on the glass. In appearance the 



