SEVENTY-FIVE YEARS OF THE TELEPHONE 237 



22. Historic Firsts— The Thermophone, Bell Lab. Record, V. 22, November 1943, p. 105. 



23. Telephone Transmission Reference System, L. J. Sivian, Elec. Comm., V. 3, October 



1924, pp. 114-126. . 



24. A Voice and Ear for Telephone Measurements, Inglis, Gray and Jenkins, Bell Sys. 



Tech. Jour., V. 11, April 1932, pp. 293-317. 



25. Public Address Systems, I. W. Green and J. P. Maxfield, A.I.E.E, Trans., V. 42, 



February 1923, pp. 64-75. 



26. Speech Power and Its Measurement, L. J. Sivian, Bell Sys. Tech. Jour., V. 8, October 



1929, pp. 646-661. 



27. New 548 Type Loud Speaking Telephone, Bell. Lab. Record, V. 6, December 1925, 



pp. 160-163. 



28. A High Efficiency Receiver for a Horn Type Loudspeaker of Large Power Capacity, 



A. L. Thuras and E. C. Wente, Bell Sys. Tech. Jour., January 1928, pp. 140-153, 

 V. 7. 



29. Master Reference System for Telephone Transmission, W. H. Martin and C. H. G. 



Gray, Bell Sys. Tech. Jour., V. 8, July 1929, pp. 536-559. 



30. Articulation Testing Methods by Fletcher and Steinberg, Bell Sys. Tech. Jour., V. 8, 



October 1929, pp. 806-854. 



31. Speech and Hearing, H. Fletcher, D. Van Nostrand, N. Y., 1929. 



32. The Nature of Speech and Its Interpretation, H. Fletcher, Bell. Sys Tech. Jour., 



July 1922, V. 1, pp. 129-144. 



33. Physical Measurements of Audition and Their Bearing on the Theory of Hearing, 



H. Fletcher, Bell Sys. Tech. Jour., V. 2, October 1923, pp. 145-180. 



34. The Physical Properties of Speech, Music and Noise and Their Relation to Transmis- 



sion Problems, H. Fletcher, B.T.L. Reprint B-94-1. (An address before N.Y. Tel. 

 Soc. and N.Y. Elec. Soc, February 1924.) 



35. The Dependence of the Loudness of a Complex Sound Upon the Energy in the Various 



Frequency Regions of the Sound, Fletcher and Steinberg, Fhys. Rev., V. 24, Sep- 

 tember 1924, pp. 306-317. 



36. Effects of Distortion upon the Recognition of Speech Sounds, J. C. Steinberg, Acousti- 



cal Soc. of America Jl., V. 1, October 1929, pp. 121-137. 



37. Developments in the Application of Articulation Testing, T. G. Castner and C. W. 



Carter, Jr., Bell Sys. Tech. Jour., V. 12, July 1933, pp. 347-370. 



38. Factors Governing the IntelligibiHty of Speech Sounds, French and Steinberg, Acous- 



tical Soc. Am. JL, V. 19, pp. 90-119, January 1947. 



39. The Perception of Speech and Its Relation to Telephony, Fletcher and Gait, J.A.S.A., 



V. 22, No. 2, March 1950, pp. 89-151. 



40. Rating the Transmission Performance of Telephone Circuits, W. H. Martin, Bell 



Sys. Tech. Jour., V. 10, January 1931, pp. 116-131. 



41. A System of Effective Transmission Data for Rating Telephone Circuits, F. W. 



McKown and J. W. Emling, Bell Sys. Tech. Jour., V. 12, July 1933, pp. 331-346. 



42. Theory of Vibrating Systems and Sound, I. B. Crandall, D. Van Nostrand, N.Y., 1926. 



43. Theory of Magneto-Mechanical Systems as Applied to Telephone Receivers and Simi- 



lar Structures, R. L. Wegel, AJ.E.E. JL, V. 40, October 1921, pp. 791-802. 



44. Acoustical Instruments, E. C. Wente, Bdl Sys. Tech. Jour., V. 14, July 1935, pp. 



388^12. 



45. Methods of High Quality Recording and Reproducing of Music and Speech Based 



on Telephone Research, J. P. Maxfield and H. C. Harrison, Bell Sys. Tech. Jour., 

 V. 5, July 1926, pp. 493-523. 



46. Historic Firsts— The Orthophonic Phonograph, Bell Lab. Record, V. 24, August 1946, 



pp. 300-301. 



47. Magnetic Materials in the Telephone System, V. E. Legg, Bell Sys. Tech. Jour., V. 



18, July 1939, pp. 438-464. . . 



48. The Theory of the Operation of the Howling Telephone with Experimental Confirma- 



tion, H. Fletcher, Bell Sys. Tech. Jour., V. 5, January 1926, pp. 27-49. 



49. The Development of a Handset for Telephone Stations, A. H. Inglis and W. C. Jones, 



Bell Sys. Tech. Jour., V. 11, April 1932, pp. 245-263. 



50. Instruments for the New Telephone Sels, \V. C. Jones, Bell Sys. Tech. Jour., V. 17, 



July 1938, pp. 338-357. 



51. Transmission Features of the New Telephone Sets, A. H. Inglis, Bell Sys. Tech. Jour., 



V. 17, July 1938, pp. 358-380. 



52. An Improved Telephone Set, A. H. Inglis and W. L. Tuffnell, Bell Sys. Tech. Jour., 



V. 30, April 1951. 



