252 



Sir J. J. Thomson : Further 



in 



the previous experiments had served as the cathode 

 for the anode, and to use for the cathode a flat plate of 

 aluminium placed so that the normal to its plane passed 

 through the hole in the other electrode. By giving an 

 exposure of over an hour and using a larger tube (about 

 1 mm. in diameter) for the perforated electrode, I have- 

 Fig-. 26. 



JYejsCCrcs 











~V 



\ 



Z 1 































































f 













































1 























i 













































i 











































1 























A 























1 













































_l\ 



-A 



-A 













A 



> 



/u 



J 



^ 







H 2 C O CO CI 



Phos g ene Gas. CO CL 



Positives 



320Vo!ts 



succeeded in getting photographs of these rays, one of which 

 is reproduced in fig. 28 (PL IX.) ; the definition is not good 

 owing to the size of the tube. But in the photograph can be 

 seen rays corresponding to the hydrogen atom and molecule 

 and to the oxygen atom. An interesting point about the 

 photograph is that the negative side (the left) is stronger than 



