Contributors to this Issue 



H. A. Affel, S.B. in Electrical Engineering, Massachusetts Insti- 

 tute of Technology, 1914; Research Assistant in Electrical Engineering, 

 1914-16. Engineering Department and the Department of Develop- 

 ment and Research, American Telephone and Telegraph Company, 

 1916-34. Bell Telephone Laboratories, 1934-. Mr. Affel has been 

 engaged chiefly in development work connected with carrier telephone 

 and telegraph systems. 



E. H. Bedell, B.S., Drury College, 1924; University of Missouri, 

 1924-25. Bell Telephone Laboratories, Acoustical Research Depart- 

 ment, 1925-. Mr. Bedell's work has had to do mainly with studies of 

 sound absorption and transmission and allied subjects in the field of 

 architectural acoustics. 



Arthur G. Chapman, E.E., University of Minnesota, 1911. Gen- 

 eral Electric Company, 1911-13. American Telephone and Telegraph 

 Company, Engineering Department, 1913-19, and Department of 

 Development and Research, 1919-34. Bell Telephone Laboratories, 

 1934-. Mr. Chapman is in charge of a group engaged in developing 

 methods for reducing crosstalk between communication circuits, both 

 open wire and cable, and evaluating effects of crosstalk on telephone 

 and other services. 



R. W. Chesnut, A.B., Harvard University, 1917; War Depart- 

 ment of French Government, 1917; U. S. Army, 1917-19. Engineer- 

 ing Department, Western Electric Company, 1920-25; Bell Telephone 

 Laboratories, 1925-. Mr. Chesnut has been engaged in the develop- 

 ment of carrier telephone and long-wave radio systems. 



Harvey Fletcher, B.Sc, Brlgham Young University, 1907; Ph.D., 

 University of Chicago, 1911; Instructor of Physics, Brlgham Young 

 University, 1907-08, and University of Chicago, 1909-10; Professor, 

 Brlgham Young University, 1911-16. Engineering Department, 

 Western Electric Company, 1916-25; Bell Telephone Laboratories, 

 1925-. As Acoustical Research Director, Dr. Fletcher Is In charge of 

 investigations in the fields of speech and audition. 



Frederick S. Goucher, A.B., Acadia University, 1909; A.B., 

 Yale University, 1911; M.A., Yale, 1912; Ph.D., Columbia University, 

 1917. Western Electric Company, 1917-18. University College, 

 London, 1919. Research Laboratories, General Electric Company, 

 Limited, North Wembley, England, 1919-26. Bell Telephone Labora- 

 tories, 1926-. Dr. Goucher has been engaged in a study of the carbon 



microphone. 



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