Contributors to this Issue 



W. J. Albersheim, Technical Colleges, Aachen and Munich, Germany; 

 B.Sc, Aachen, 1920; E.E., Aachen, 1922; Doctor of Engineering, Aachen, 

 1924; Professional Engineer, University of State of New York, 1937. Elec- 

 trical Research Products, Inc., 1929-41; Bell Telephone Laboratories, 

 1941-. Dr. Albersheim was concerned with radar and jamming work during 

 the war; he is now engaged in broadband FM transmission problems. 



W. B. Hebenstreit, A. A., University of Chicago, 1935; B.S., Cahfornia 

 Institute of Technology, 1941. Bell Telephone Laboratories, 1941-47. 

 While at the Bell Telephone Laboratories Mr. Hebenstreit worked on var- 

 ious microwave vacuum tubes including magnetrons, traveling wave tubes 

 and the new double stream amplifier. He is now with the Hughes Aircraft 

 Company. 



A. V. HoLLENBERG, A.B., Willamette University, 1931 ; M.S., 1933, Ph.D., 

 1938, New York University; Instructor in Physics, Queens College, 1938-42. 

 Columbia Radiation Laboratory, 1942-45; Bell Telephone Laboratories, 

 1946-. Dr. Hollenberg was engaged in research and development work on 

 microwave magnetrons at the Columbia Radiation Laboratory. At Bell 

 Telephone Laboratories he has been concerned with traveling wave ampli- 

 fiers. 



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

 nology, 1933; Ph.D., 1936. Bell Telephone Laboratories, 1936-. Engaged 

 in study of vacuum tubes. 



S. (). Rice, B.S. in Electrical Engineering, Oregon State College, 1929; 

 C^difornia Institute of Technology, 1929-30, 1934-35. Bell Telephone 

 Laboratories, 1930-. Mr. Rice has been concerned with various theoretical 

 investigations relating to telephone transmission theory. 



Slo.^x D. Robertson, B.E.E., University of Dayton, 1936; M.Sc, Ohio 

 State University, 1938, Ph.D., 1941; Instructor of Electrical Engineering, 

 University of Dayton, 1940. Bell Telephone Laboratories, 1940-. Dr. 

 Robertson was engaged in microwave radar work in the Radio Research 

 Department during tiie war. He is now engaged in fundamental micro- 

 wave radio research. 



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