634 BELL SYSTEM TECHNICAL JOURNAL 



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

 engaged in the investigation of special problems connected with radio 

 and vacuum tubes. 



G. A. Locke, B.S., Cooper Union, 1920; E.E., Cooper Union, 1923. 

 New York Telephone Company, 1908-15. Western Electric Com- 

 pany, Engineering Department, 1915-17. Ignited States Signal 

 Corps, 1917-19. Western Electric Company, Engineering Depart- 

 ment, 1919-24. Bell Telephone Laboratories, 1924- Mr. Locke is 

 engaged in the development of telegraph switching circuits. 



R. E. Pierce, Cornell University, 1913, A.B. and M.E. American 

 Telephone and Telegraph Company, Engineering Department 

 1913-1919; Department of Operation and Engineering, 1919-. Mr. 

 Pierce has been engaged in work on telegraph matters and during the 

 period with the Department of Operation and Engineering has been in 

 charge of telegraph engineering. 



F. W. Reynolds, B.S. in Electrical Engineering, Union College, 

 1919; Ph.D., Cornell University, 1924; Signal Corps, U. S. A., 1918. 

 American Telephone and Telegraph Company, Department of Devel- 

 opment and Research, 1924-1934; Bell Telephone Laboratories, 1934-. 

 Dr. Reynolds has been engaged in the development of telephotography. 



F. J. Singer, B.S. in Electrical Engineering, University of Wash- 

 ington, 1920; M.S. in Electrical Engineering, University of Wisconsin, 

 1922. American Telephone and Telegraph Company, Department of 

 Development and Research, 1922-34. Bell Telephone Laboratories, 

 1934-. As Telegraph Switching Engineer, Mr. Singer is engaged in 

 the development of telegraph switching and testing facilities. 



