238 THE BELL SYSTEM TECHNICAL JOURNAL, APRIL 1951 



53. Microphonic Action in Telephone Transmitters, F. S. Goucher, Bell Lab. Record, 



V. 8, August 1930, pp. 566-569. 



54. The Carbon Microphone: An Account of Some Researches Bearing on Its Action, 



F. S. Goucher, Bell Sys. Tech. Jour., V. 13, April 1934, pp. 163-194. 



55. The Ring Armature Telephone Receiver, E. E. Mott and R. C. Miner, Bell Sys. Tech. 



Jour., V. 30, No. 1, January 1951, pp. 110-140. 



56. A Moving Coil Microphone for High QuaUty Sound Reproduction, W. C. Jones and 



L. W. Giles, //. ofSoc. of Motion Pic. Engrs., V. 17, December 1931, pp. 977-993. 



57. An Efl&cient Miniature Condenser Microphone System, H. C. Harrison and P. B. 



Flanders, Bdl Sys. Tech. Jour., V. 11, July 1932, pp. 451-461. 



58. A Non-Directional Microphone, R. N. Marshall and F. F. Romanow, Bell Sys. Tech. 



Jour., V. 15, July 1936, pp. 405-423. 



59. A Tubular Directional Microphone, W. P. Mason and R. N. Marshall, //. A.S. of 



A., V. 10, January 1939, pp. 206-215. 



60. New Microphone Providing Uniform Directivity Over Extended Frequency Range, 



R. N. Marshall and W. R. Harry, //. A. S. of A., V. 12, April 1941, pp. 481-498. 



61. An EflBicient Loudspeaker at the Higher Audible Frequencies, L. G. Bostwick, //. 



A.S. of A., V. 2, October 1930, pp. 242-250. 



62. Auditory Perspective — Loudspeakers and Microphones, E. C. Wente and A. L. Thuras, 



Bell Sys. Tech. Jour., V. 13, April 1934, pp. 259-277. 



63. Modem Theater Loudspeakers and Their Development, C. Flannagan, R. Wolf and 



W. C. Jones, S.M.P.E. Jl., V. 28, pp. 246-263, March 1937. 



64. Patents 1,638,555 and 1,656,255 issued to E. C. Wente. 



65. The Principles of the Light Valve, Shea, Herriot and Goehner, Soc. of Motion Picture 



Engineers Journal, V. 18, pp. 697-731, June 1932. 



66. Recent Developments in Hill and Dale Recorders, L. Vieth and C. F. Wiebusch, 



S.M.P.E. JL, V. 30, January 1938, pp. 96-104. 



67. Lateral Feedback Disc Recorders, G. A. Yenzer, Audio Engineer, V. 33, September 



1949, pp. 22-26, 44-45. 



68. Universal Phonograph Reproducer, H. A. Henning, Bell Lab. Record, V. 19, October 



1940, pp. 57-60. 



69. Two Inventions Aid Hard of Hearing, W.E.Co. News, V. 14, November 1925, pp. 



24^29. 



70. Hearing Aids and Deafness, H. Fletcher, Bell Lab. Record, V. 5, October 1927, pp. 



33-37. 



71. Audiphones, W. L. Betts, Bell Lab. Record, V. 10, June 1932, pp. 362-366. 



72. A Modernized Hearing Aid, R. Nordenswan, Bell Lab. Record, V. 15, January 1937, 



pp. 163-166. 



73. The Orthotechnic Audiphone, W. L. Tuffnell, Bell Lab. Record, V. 18, September 



1939, pp. 8-11. 



74. Bone Conduction Receiver, M. S. Hawley, Bell Lab. Record, V. 18, September 1939, 



pp. 12-14. 



75. Models 65-66 Hearing Aids, J. R. Power, Bell Lab. Record, V. 26, January 1948, pp. 



30-33. 



76. Audiometric Measurements and Their Uses, H. Fletcher, Volta Rev., V. 26, January 



1924, pp. 10-14. 



77. 5A Audiometer, L. G. Hoyt, Bell Lab. Record, V. 5, January 1928, pp. 159-162. 



78. The 6BP Audiometer, A. H. Miller, Bell Lab. Record, V. 23, December 1945, pp. 



464-465. 



79. Historic Firsts— The Audiometer, Bell Lab. Record, V. 24, February 1946, pp. 57-58. 



80. Scientists Against Time, J. P. Baxter, 3rd. Little, Brown and Company, Boston 1946, 



pp. 175-176. 



