532 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1956 



for use at 11,000 megacycles since June of 1954. He is the author of 

 articles published by the Journal of Applied Physics, Proceedings of the 

 I.R.E., and the B.S.T.J., and he is a Member of the American Physical 

 Society, Tau Beta Pi, and Sigma Xi. 



Amos E. Joel, Jr., B.S., Massachusetts Institute of Technology, 

 1940; M.S., 1942; Bell Telephone Laboratories, 1940-. IMr. Joel's first 

 assignment was in relay engineering. He then worked in the crossbar 

 test laboratory and later conducted fundamental development studies. 

 During World War II, he made studies of communications projects 

 and from 1944 to 1945 designed circuits for a relay computer. Later he 

 prepared text and taught a course in switching design. The next two 

 years were spent designing AM A computer circuits, and since 1949 

 Mr. Joel has been engaged in making fundamental engineering studies 

 and directing exploratory development of electronic switching systems. 

 He was appointed Switching Systems Development Engineer in 1954. 

 Member of A.I.E.E., I.R.E., Association for Computing Machinery, and 

 Sigma Xi. 



Esther M. Rentrop, B.S., 1926, Louisiana State Normal College. 

 Miss Rentrop joined the transmission group of the Development and 

 Research Department of the American Telephone and Telegraph Com- 

 pany in 1928, and transferred to Bell Laboratories in 1934. In both com- 

 panies she has been concerned principally wdth control of crosstalk, both 

 in field studies and transposition design work. During World War II, 

 she assisted in problems of the Wire Section, Eatontown Signal Corps 

 Laboratory at Fort Monmouth, and later she worked on other military 

 projects at the Laboratories for the duration of the war. Miss Rentrop is 

 presently a member of the noise and crosstalk studies group of the Out- 

 side Plant Engineering Department and is engaged in studies of inter- 

 ference prevention. 



Jack L. Rosenfeld is a student in electrical engineering at the Mas- 

 sachusetts Institute of Technology. He will receive the S.M. and S.B. 

 degrees in 1957. He has been with Bell Telephone Laboratories on co- 

 operative assignments in microwave tube development and electronic 

 central office during 1954 and 1955. He is a student member of the I.R.E. 

 and a member of Tau Beta Pi and Eta Kappa Nu. 



Joseph A. Saloom, Jr., B.S., 1948, M.S., 1949, and Ph.D., 1951, all 

 in Electrical Engineering, University of Illinois. He joined Bell Labora- 

 tories in 1951. Mr. Saloom worked on electron tube development at' 



