96 BELL SYSTEM TECHNICAL JOURNAL 



19. B. A. Kingsbury, "The Shot Effect in Photoelectric Currents," Ph\s. Rev., 



V. 38, 1931, p. 1458-76. 



20. F. V. Orbdn, "Schroteffekt und Wiirmegrausch im Photozelienv'erstarker " 



("Shot Effect and Thermal Noise in Photoelectric Cell Amplifiers"), Zeits. f. 

 Techn. Phys., v. 13, 1932, p. 420-4 and v. 14, 1933, p. 137-43. 



21. E. Steinke, "Natiirliche Schwankung schwachster Photostrome" ("Natural 



Fluctuations of Very Small Photoelectric Currents"), Zeits. f. Phys., v. 38, 

 1926, p. 378-403. 



22. S. Ballantine, "Fluctuation Noise Due to Collision Ionization in Electronic 



Amplifier Tubes," Phys., v. 4, 1933, p. 294-306. 



23. N. P. Case, "Receiver Design for Minimum Fluctuation Noise," /. R. E. Proc, 



V. 19, 1931, p. 963-70. 



24. Ci. F. Metcalf and T. M. Dickinson, "A New Low Noise \'acuum Tube," Phvs., 



V. 3, 1932, p. 11-17. 



25. J. S. Donal, "Abnormal Shot Effect of Ions of Tungftous and Tungstic O.xide," 



Phys. Rev., v. 36, 1930, p. 1172-89. 



26. H. N. Kozanowski and N. H. Williams, "Shot Effect of the Emission From 



Oxide Cathodes," Phys. Rev., v. 36, 1930, p. 1314-29. 



27. L. P. Smith, "Effect of Positive Ion Shot Effect on Space Charge Limited 



Currents," Phys. Rev., v. 35, 1930, p. 1430. 



28. E. W. Thatcher and N. H. Williams, "Shot Effect in Space Charge Limited 



Currents," Phys. Rev., v. 39, 1932, p. 474-96. 



29. E. B. Moullin and H. D. M. Ellis, "The Spontaneous Background Noise in 



Amplifiers Due to Thermal Agitation and Shot Effects." Jour. I. E. E., 

 V. 74, 1934, p. 323-356. 



30. E. A. Johnson and C. Neitzert, "The Measurement of Small Alternating Voltages 



at Audio-frequencies," Rev. Sci. Inst., v. 5, 1934, p. 196-200. 



31. W. Brentzinger and H. Viehmann, "Das Rauschen von Empfangern" ("Noise 



in Radio Receivers"), Hochfr. und Elektroauk., v. 39, 1932, p. 199-207. 

 M. M. J. Kelly, "Vacuum Tube and Photoelectric Tube Developments for Sound 



Picture Systems," Jout. Soc. Motion Picture Engrs., v. 18, 1932, p. 761-81. 

 i?). J. O. McNally, "Analysis and Reduction of Output Disturbances Resulting 



From the Alternating-Current Operation of the Heaters of Indirectly Heated 



Cathode Triodes," /. R. E. Proc, v. 20, Aug. 1932, p. 1263-83. 



34. H. M. Freeman, "A Practical Alternating-Current Radio Receiving Tube," 



Elec. Jour., v. 19, Dec. 1922, p. .501-5. 



35. F. G. McCullough, "Thermionic Tubes," I. R. E. Proc, v. 10, Dec. 1922, 



p. 468-85. 



36. A. W. Hull, "A Combined Kenotron Rectifier and Pliotron Receiver Capable 



of Operation by Alternating Current Power," /. R. E. Proc, v. 11, April 

 1923, p. 89-96. 



37. B. F. Aleissner, "AC as a Filament Supply Source," Radio Broadcast, v. 10, 



Feb. 1927, p. 393-6, March 1927, p. 495-7. 



38. W. J. Kimmell, "The Cause and Prevention of Hum in Receiving Tubes Em- 



ploying AC Direct on the Filament," I. R. E. Proc, v. 16, Aug. 1928, p. 

 1089-1106. 



39. D. B. Penick, "The Measurement and Reduction of Microphonic Noise in 



Vacuum Tubes," Bell Sys. Tech. Jour., v. 13, Oct. 1934, p. 614-33. 



40. A. C. Rockwood and W. R. Ferris, "Microphonic Improvement in Vacuum 



Tubes," /. R. E. Proc, v. 17, Sept. 1929, p 1621-32. 



41. S. Ballantine, "Fluctuation Noise in Radio Receivers," /. R. E. Proc, v. 18, 



Aug. 1930, p. 1377-87. 



42. E. N. Dingley, "A Common Source of Error in Measurements of Receiver 



Selectivity," /. R. E. Proc, v. 22, May 1934, p. 546. 



