Contributors to this Issue 



John T. Bangert, B.S. in E.E., University of ^Michigan, 1942; 

 M.S. in E.E., Stevens Institute of Technology, 1947; doctoral studies, 

 Columbia University, 1951-. Bell Telephone Laboratories, 1942-. Fol- 

 lowing design work on various military systems and test equipment 

 during World War II, JVIr. Bangert turned his attention to investigations 

 of fundamental problems in transmission and communication theory. 

 Recently he has been exploring new methods of analj'sis and sj-nthesis 

 of active and passive networks in the time and freciuency domain. Mem- 

 ber of Sigma Xi, Tau Beta Pi, Phi Kappa Phi, Eta Kappa Nu, I.R.E., 

 and Association for Computing Machinery. 



Clayton B. Brown, B.S. in E.E., Polytechnic Institute of Brookl^ai, 

 1952; Bell Telephone Laboratories, 1937-1940; Western Electric Com- 

 pany, 1940-1943; Bell Telephone Laboratories, 1943-. During World 

 War II he worked on the development of precision potentiometers, later 

 doing test work on the automatic trouble recorder; magnet design and 

 test work on the card translator. He is presently concerned with the 

 planning, analysis, and testing of switching apparatus and solderless 

 wrapped connections. 



Donald F. Johnston, B.S. in E.E., Catholic University of America, 

 1922; Western Electric Company, 1922-1925; Bell Telephone Labora- 

 tories, 1925-. From 1922 to 1924, Mr. Johnston prepared literature de- 

 scribing methods of circuit operation. With the Laboratories he has been 

 concerned with testing and development of toll testing and switching 

 circuits. 



. J. A. LE^^s, B.S., Worcester PoMechnic Institute, 1944; Sc.M., 

 Brown University, 1948; Ph.D., Brown I'niversity, 1950; Corning Glass 

 Works, 1950-1951; Bell Telephone Laboratories, 1951-. With the Labo- 

 ratories, he has been concerned with mathematical research in theoretical 

 mechanics, piezoelectric crystal vibrations, heat transfer, and stress anal- 

 ysis. ]\Iember American Mathematical Society, Sigma Xi. 



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