Contributors to this Issue 



W. H. Martin, A.B., Johns Hopkins University, 1909; S.B., 

 Massachusetts Institute of Technology, 1911. American Telephone 

 and Telegraph Company, Engineering Department, 1911-19; Depart- 

 ment of Development and Research, 1919-. Mr. Martin's work 

 has related particularly to transmission of telephone sets and local ex- 

 change circuits, transmission quality and loading. 



H. S. Osborne, B.S., Massachusetts Institute of Technology, 1908; 

 Austin Research Fellow in Engineering, 1908-10; Eng.D., 1910; 

 American Telephone and Telegraph Company, Engineering Depart- 

 ment, 1910-19; Department of Development and Research, 1919-20; 

 Department of Operation and Engineering, 1920-. Mr. Osborne is 

 Transmission Engineer and as such is responsible for assisting the 

 Associated Companies in connection with telephone and telegraph 

 transmission and protection matters. 



G. W. Elmen, B.S., University of Nebraska, 1902; M.A., 1904; 

 Research Laboratories of the General Electric Company, 1904-06; 

 Engineering Department of the Western Electric Company, 1906-25; 

 Bell Telephone Laboratories, 1925-. Mr. Elmen's principal line of 

 work has been magnetic investigations. He is the inventor of the 

 permalloy alloys. For this he was awarded the John Scott Medal in 

 1926 and the Elliott Cresson Medal in 1928. 



H. O. SiEGMUND, B.S., University of Illinois, 1917; E.E., University 

 of Illinois 1926; Instructor, U. S. Army School of Military Aeronautics, 

 1917-1918; Assistant Professor of Electrical Engineering, Drexel 

 Institute, 1918-1919; Engineering Department, Western Electric 

 Company, 1919-1925; Bell Telephone Laboratories, 1925-. Mr. 

 Siegmund has been engaged in apparatus development work and has 

 made contributions relating to telephone power plant apparatus and 

 circuits, to provide more quiet transmission. 



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

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

 mathematics. University of Chicago, 1917; Engineering Department, 

 Western Electric Company, 1917-25; Bell Telephone Laboratories, 

 Inc., 1925-. Mr. Darrow has been engaged largely in writing studies 

 and analyses of various fields of physics and the allied sciences. Some 

 of his earlier articles on Contemporary Physics form the nucleus of 

 a recently published book entitled "Introduction to Contemporary 

 Physics" (D. Van Nostrand Company). 



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