Contributors to This Issue 



Kenneth Bullington, B.S., University of New Mexico, 1936; M.S., 

 Massachusetts Institute of Technology, 1937; Bell Telephone Labora- 

 tories, 1937-. Mr. Bullington's first work with the Laboratories was on 

 systems engineering on wire transmission circuits, and since 1942 he has 

 been concerned with transmission engineering on radio systems, particu- 

 larly over-the-horizon radio propagation. In 1956, he was awarded the 

 Morris Liebmann Memorial Prize of the I.R.E. and the Stuart Ballen- 

 tine Medal from the Franklin Institute for contributions in tropospheric 

 transmission and the application of those contributions to practical 

 communication systems. He is a Fellow of the I.R.E. , and a member of 

 Phi Kappa Phi, Sigma Tau and Kappa Mu Epsilon. 



Arthur B. Crawford, B.S.E.E. 1928, Ohio State University; Bell 

 Telephone Laboratories 1928-. Mr. Crawford has been engaged in radio 

 research since he joined the Laboratories. He has worked on ultra short 

 wave apparatus, measuring techniques and propagation; microwave 

 apparatus, measuring techniques and radar; microwave propagation 

 studies and microwave antenna research. He is author or co-author of 

 articles which appeared in the Bell System Technical Journal, Proceed- 

 ings of the I.R.E., Nature and Bulletin of the American Meteorological 

 Society. He is a Fellow of the I.R.E. and a member of Sigma Xi, Tau i 

 Beta Pi, Eta Kappa Nu, and Pi Mu Epsilon. 



Harold E. Curtis, B.S. and M.S., Massachusetts Institute of Tech- 

 nology, 1929; Department of Development and Research of the Ameri- 

 can Telephone and Telegraph Company, 1929; Bell Telephone Labora- 

 tories, 1934-. Mr. Curtis has been concerned with transmission prob- 

 lems related to multi-channel carrier telephony. He has also been i 

 engaged in studies of transmission engineering aspects of the microwave 

 radio relay system. His work at the Laboratories has also included 

 pioneering transmission studies of the coaxial cable, the shielded pair and 

 quad, and the waveguide. Mr. Curtis holds ten patents relating to car- 

 rier telephony. 



Harald T. Friis, E.E., 1916, D.Sc, 1938, Royal Technical College 

 (Copenhagen); Western Electric Company, 1919; Bell Telephone Lab- 



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