Contributors to this Issue 



R. V. L. Hartley, A.B., Utah, 1909; B.A., Oxford, 1912; B.Sc, 1913; 

 Instructor in Physics, Nevada, 1909-10. Engineering Department, Bell 

 Telephone Laboratories, 1913-50. Mr. Hartley took part in the early radio 

 telephone experiments and was thereafter associated with research on teleph- 

 ony and telegraphy at voice and carrier frequencies. Later, as Research 

 Consultant he was concerned with general circuit problems. Mr. Hartley is 

 now retired from active service. 



J. R. Pierce, B.S., in Electrical Engineering, California Institute of 

 Technology, 1933; Ph.D., 1936. Bell Telephone Laboratories, 1936-. Dr. 

 Pierce has been engaged in the study of vacuum tubes. 



Claude E. Shannon, B.S., in Electrical Engineering, University of 

 Michigan, 1936; S.M. in Electrical Engineering and Ph.D. in Mathematics, 

 M.I.T., 1940. National Research Fellow, 1940. Bell Telephone Laboratories, 

 1941 -. Dr. Shannon has been engaged in mathematical research principally 

 in the use of Boolean Algebra in switching, the theory of communication, 

 and cryptography. 



George C. Southworth, B.S., Grove City College, 1914; Sc.D. (Hon.), 

 1931; Ph.D., Yale University, 1923. Assistant Physicist, Bureau of Stand- 

 ards, 1917-18; Instructor, Yale University, 1918-23. Editorial staff of The 

 Bell System Technical Journal, American Telephone and Telegraph Com- 

 pany, 1923-24; Department of Development and Research, 1924-34; Re- 

 search Department, Bell Telephone Laboratories, 1934-. Dr. Southworth's 

 work in the Bell System has been concerned chiefly with the development 

 of the waveguide as a practical medium of transmission. He is the author of 

 numerous papers relating to a diversity of subjects such as ultra-short waves, 

 short-wave radio propagation, earth currents, the transmission of micro- 

 waves along hollow metal pipes and dielectric wires and microwave radiation 

 from the sun. 



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