492 Perkins — Rectification Effect in a Vacuum Tube. 



it reaches oc at A and B, which follows of course from 



• T> Q 



assuming r a = — =- . 

 s a d 



The foregoing attempt to explain the phenomena seems to 

 account fairly well for the form of the curves obtained, as 

 well as the chief effect of rectification. The few quantitative 

 measurements so far made are not discordant with the theory, 

 and further experiments are now in progress involving chang- 

 ing the frequency, the pressure in the tube, the form of the 

 terminals, etc. ; all of which should give interesting data on 

 the various ionic properties involved. 



Jarvis Laboratory, Trinity College, Hartford, Ct., 

 March," 1908. 



