Contributors to this Issue 



Charles Clos, C.E., New York University, 1927; New York Tele- 

 j)hone Company, plant extension engineering, valuation and depreciation 

 matters, intercompany settlements and tandem and toll fundamental 

 plans, 1927-47. Pratt Institute, Evening School, Mathematics Instructor, 

 1946-49. Bell Telephone Laboratories, studies on development planning 

 for local and toll switching systems and research in switching probability, 

 1947-. Member of A.I.E.E., New York Electrical Society, Mathematical 

 Association of America, A.A.A.S., American Statistical Association, Iota 

 Alpha, and Tau Beta Pi. 



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

 Telephone Laboratories, 1928-. As a member of the Radio Research 

 Department, he has been concerned with ultra short wave apparatus, 

 measuring techniques, and propagation, and with microwave apparatus, 

 measuring techniques, and propagation, as well as microwave radar and 

 microwave antenna research. Member of I.R.E., Sigma Xi, Tau Beta 

 Pi, Eta Kappa Nu, and Pi Mu Epsilon. 



O. E. De Lange, B.S., University of Utah, 1930; M.A., Columbia 

 University, 1937. Bell Telephone Laboratories, 1930-. Mr. De Lange has 

 been engaged in radio research, including studies on high-frequency trans- 

 mitters and receivers, frequency modulation, radar, broad-band systems, 

 and pulse systems. Associate member of the I.R.E. 



C. L. HoGAN, B.S. in Ch.E., Montana State College, 1942; M.S. 

 in Physics, Lehigh University, 1947; Ph.D. in Physics, Lehigh, 1950. 

 Anaconda Copper Mining Co., Great Falls, Montana, 1942-43. U. S. 

 Navy, 1943-46. Instructor in Physics, Lehigh, 1947-50. Bell Telephone 

 Laboratories, 1950-. Dr. Hogan has engaged in development work 

 on boro-carbon resistors and microwave gyrators. Gold medal award 

 for "Outstanding Engineer in Graduating Class," Montana State Col- 

 lege, 1942. Letter of Merit from Chief of Naval Operations for work 

 done in establishing and maintaining the acoustical torpedo shop at 

 Pearl Harbor, 1944-46. Member of American Physical Society, Sigma 

 Xi, Tau Beta Pi, and Phi Kappa Phi. 



W. C. Jakes, Jr., B.S.E.E., Northwestern University, 1944; M.S., 

 Northwestern University, 1947; Ph.D., Northwestern University, 1949; 



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