CONTRIBUTORS TO THIS ISSUE ' 177 



M. J. Kelly, B.S., Missouri University, 1914; M.S., University of 

 Kentucky, 1915; Ph.D., University of Chicago, 1919; Instructor of 

 Physics, University of Kentucky, 1914-15; Research Assistant, 

 University of Chicago, 1915-18. Western Electric Company, 1918-25 ; 

 Bell Telephone Laboratories, 1925-. As Vacuum Tube Development 

 Director, Dr. Kelly has worked on the development of thermionic and 

 photoelectric devices. 



Frederick B. Llewellyn, M.E., Stevens Institute of Technology, 

 1922; Ph.D., Columbia University, 1928. Western Electric Company, 

 1923-25; Bell Telephone Laboratories, 1925-. Dr. Llewellyn has been 

 engaged in the investigation of special problems connected with radio 

 and vacuum tubes. 



Lewis R. Lowry, B.S. in Electrical Engineering, University of 

 Washington, 1927. Pacific Telephone and Telegraph Company, 

 summers 1922-26. Member, Technical Staff, Bell Telephone Labora- 

 tories, 1927- 



H. T. O'Neil, B.S. in Electrical Engineering, State College of 

 Washington, 1923. Engineering Department, Western Electric Com- 

 pany, 1923-25. Bell Telephone Laboratories, 1925- Mr. O'Neil has 

 been engaged in theoretical acoustic research. 



H. A. PiDGEON, B.S., Ohio University, 1911; M.S., 1912; Ph.D., 

 Cornell University, 1918. Western Electric Company, Engineering 

 Department, 1918-25. Bell Telephone Laboratories, 1925-. As 

 Vacuum Tube Development Engineer, Dr. Pidgeon is engaged in 

 research and development work on vacuum tubes. 



A. L. Samuel, A.B., College of Emporia (Kansas), 1923; S.B. and 

 S.M. in Electrical Engineering, Massachusetts Institute of Tech- 

 nology, 1926. Instructor in Electrical Engineering, Massachusetts 

 Institute of Technology, 1926-28. Bell Telephone Laboratories, 

 1928-. Mr. Samuel has been engaged in research and development 

 work on vacuum tubes. 



E. E. Schumacher, B.S., University of Michigan; Research As- 

 sistant in Chemistry, 1916-18. Engineering Department, Western 

 Electric Company, 1918-25; Bell Telephone Laboratories, 1925-. 

 As Assistant Research Metallurgist, Mr. Schumacher is in charge of 

 a group whose work relates largely to research studies on metals and 

 alloys. 



