Contributors to this Issue 



R. M. Burns, A.B., University of Colorado, 1915; A.M., 1916; 

 Ph.D., Princeton University, 1921 ; Instructor, University of Colorado, 

 1916-1 7. Second Lieutenant, Chemical Warfare Service, U. S. Army, 

 1918-19. Research chemist, Barrett Company, 1921-22, Western 

 Electric Company, 1922-25. Bell Telephone Laboratories, 1925-; 

 Assistant Chemical Director, 1931-. Dr. Burns' work has been largely 

 in the electrochemical field and particularly on the subject of the 

 corrosion of metals and its prevention. 



John R. Carson, B.S., Princeton, 1907; E.E., 1909; M.S., 1912. 

 American Telephone and Telegraph Company, 1914-34; Bell Tele- 

 phone Laboratories, 1934-. As Transmission Theory Engineer for 

 the American Telephone and Telegraph Company and later for 

 the Laboratories, Mr. Carson has made substantial contributions to 

 electric circuit and transmission theory and has published extensively 

 on these subjects. He is now a research mathematician. 



Carl J. Christensen, B.S., Brigham Young University, 1923; 

 M.S., University of Wisconsin, 1925; Ph.D., University of California, 

 1929. Instructor in Chemistry and Physics, Brigham Young Uni- 

 versity, 1923-24 and 1925-27. Bell Telephone Laboratories, 1929-. 

 Dr. Christensen has been engaged in research in connection with 

 microphone carbon. 



H. E. Curtis, S.B. and S.M. in Electrical Engineering, Massa- 

 chusetts Institute of Technology, 1929. American Telephone and 

 Telegraph Company, Department of Development and Research, 

 1929-34; Bell Telephone Laboratories, 1934-. Mr. Curtis has been 

 engaged in high-frequency transmission problems as related to carrier 

 systems. 



Karl K. Darrow, B.S., University of Chicago, 1911 ; University of 

 Paris, 1911-12; University of Berlin, 1912; Ph.D., University of 

 Chicago, 1917. Western Electric Company, 1917-25; Bell Telephone 

 Laboratories, 1925-. Dr. Darrow has been engaged largely in writing 

 on various fields of physics and the allied sciences. 



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