ULTRA-HIGH-FREQUENCY VACUUM TUBES 665 



3. Johannes Miiller, "Elektronenschwingungen im Hochvakuum." Hochjrequenz- 



technik und Elektroakustik, Vol. 41, May 1933. 



4. F. B. Llewellyn, "Note on Ultra-High-Frequency Electronics." Proc. I.R.E., 



Vol. 23, February 1935. 



5. W. E. Benham, "Electronic Theory and the Magnetron Oscillator." Proc. 



Phys. Soc, Vol. 47, January 1935. 



6. Compton and Langmuir, "Electrical Discharges in Gases," Part II. Rev. of 



Mod. Physics, Vol. 3, April 1931. 



7. B. J. Thompson and W. R. Ferris, Oral paper at Rochester I.R.E., 1934. 



8. J. G. Chaffee — Forthcoming discussion on (7). 



9. J. G. Chaffee, "The Determination of Dielectric Properties at Very High Fre- 



quencies." Proc. I.R.E., Vol. 22, August 1934. 



10. W. R. Ferris, "Input Resistance of Vacuum Tubes as Ultra-High Frequency 



Amplifiers." * 



11. D. O. North, "Analysis of the Effects of Space Charge on Grid Impedance." * 



* To be published shortly. Much of the material was presented orally by B. J. 

 Thompson and W. R. Ferris at various technical meetings including: 

 U. R. S. I. and /. R. E., Washington, April 27, 1934. 

 Philadelphia section of /. R. E., January 3, 1935. 

 Reference (7) above. 



