CONTRIBUTORS TO THIS ISSUE 193 



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. 



S. A. ScHELKUNOFF, B.A., M.A. in Mathematics, The State College 

 of Washington, 1923; Ph.D. in Mathematics, Columbia University, 

 1928. Engineering Department, Western Electric Company, 1923-25 ; 

 Bell Telephone Laboratories, 1925-26. Department of Mathematics, 

 State College of Washington, 1926-29. Bell Telephone Laboratories, 

 1929-. Dr. Schelkunoff has been engaged in mathematical research, 

 especially in the field of electromagnetic theory. 



W. Shockley, B.Sc, California Institute of Technology, 1932; 

 Ph.D., Massachusetts Institute of Technology, 1936. Bell Telephone 

 Laboratories, 1936-. Dr. Shockley's work in the Laboratories has 

 been concerned with problems in electronics. 



Rexford S. Tucker, A.B., Harvard University, 1918; S.B. in 

 Electrical Engineering, Harvard Engineering School, 1922. American 

 Telephone and Telegraph Company, Department of Development and 

 Research, 1923-1934. Bell Telephone Laboratories, 1934-. Mr. 

 Tucker's work has been on noise and crosstalk problems. 



M. A. Weaver, E.E., Lehigh University, 1915. American Tele- 

 phone and Telegraph Company, Long Lines Department and Depart- 

 ment of Development and Research, 1915-34; Bell Telephone Labora- 

 tories, 1934-. Mr. Weaver is engaged in development work connected 

 with crosstalk and noise problems of voice and carrier-frequency 

 circuits. 



