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VII. Reply to the Investigation of Mr. A. A. Campbell Swinton 

 " on the Reflexion of Cathode Rays" 



To the Editors of the Philosophical Magazine. 

 Gentlemen, 



IIS the conclusion of his investigation " On the Reflexion of 

 Cathode Rays," Mr. Campbell Swinton remarks con- 

 cerning my publication of the same title, as follows * : — 



" Mr. Starke f appears to have found, that so long as the 

 same face of the reflector was turned towards both the 

 cathode and cylinder, the orientation of the reflector did not 

 affect the amount of charge conveyed to the cylinder. This 

 is so totally at variance with the results given above, which 

 were repeated over and over again, that the writer can only 

 assume that the methods employed by Mr. Starke were not 

 so sensitive as his own . . . ." 



To show that this interpretation of my results is not quite 

 correct, I beg you to accept this paper for the ' Philosophical 

 Magazine/ 



My experiments were begun chiefly to decide the question, 

 whether there is any reflexion of cathode rays or not. For 

 this purpose I employed the tube shown in the figure. So 



long as the incident cathode rays and the axis of the Faraday 

 cylinder B (which make an angle of nearly 60° with one 

 another) struck the same side of the anticathode R, electricity 

 was conveyed into the inner cylinder and was indicated by 

 a high-resistance galvanometer connected with it. When 



* Proc. Roy. Soc. vol. lxiv. 1899, p. 395. 

 t Wied. Ann. vol. Ixvi. pp. 49-60 (1898). 



