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. American Telephone and Telegraph Company, Engineering 

 Department and the Department of Development and Research, 

 1916-34; Bell Telephone Laboratories, 1934-. As Assistant Director 

 of Transmission Development, Mr. Afifel is engaged in development 

 work connected with^carrier telephone and telegraph systems. 



Ralph Bown, M.E., 1913; M.M.E., 1915; Ph.D., 1917, Cornell 

 University. Captain, Signal Corps, U. S. Army, 1917-19. American 

 Telephone and Telegraph Company, Department of Development and 

 Research, 1919-34; Bell Telephone Laboratories, 1934-. As Radio 

 Research Director, Dr. Bown is concerned wuth radio development 

 problems. He is a Past President of the Institute of Radio Engineers. 



Charles R. Burrows, B.S. in Electrical Engineering, University 

 of Michigan, 1924; A.M., Columbia University, 1927; E.E., Univer- 

 sity of Michigan, 1935. Research Assistant, University of Michigan, 

 1922-23. Western Electric Company, Engineering Department, 1924- 

 25; Bell Telephone Laboratories, Research Department, 1925-. Mr. 

 Burrows has been associated continuously with radio research and is 

 now in charge of a group investigating the propagation of ultra-short 

 waves. 



John R. Carson, B.S., Princeton, 1907; E.E., 1909; M.S., 1912. 

 American Telephone and Telegraph Company, 1914-34; Bell Tele- 

 phone Laboratories, 1934-. As Transmission Theory Engineer for the 

 American Telephone and Telegraph Company and later for the Labora- 

 tories, Mr. Carson has made substantial contributions to electric 

 circuit and transmission theory and has published extensively on these 

 subjects. He is now a research mathematician. 



Thornton C. Fry, A.B., Findlay College, 1912; A.M., University of 

 Wisconsin, 1913; Ph.D., 1920; Instructor in mathematics. University 

 of Wisconsin, 1912-16. Mathematician, Western Electric Company, 

 1916-24; Bell Telephone Laboratories, since 1924. Lecturer electrical 

 engineering, M.I.T., 1927; Lecturer mathematics, Princeton, 1929-30. 

 Dr. Fry's work in the Laboratories has been of a mathematical 

 character, 



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