Contributors to this Issue 



H. A. Affel, S.B. in Electrical Engineering, Massachusetts Insti- 

 tute of Technology, 1914; Research Assistant in Electrical Engineering, 

 1914-16. Engineering Department and the Department of Develop- 

 ment and Research, American Telephone and Telegraph Company, 

 1916-. Mr. Affel has been engaged chiefly in development work 

 connected with carrier telephone and telegraph systems. 



C. R. Avery, B.S. in Mechanical Engineering, University of Mich- 

 igan, 1918; M.S., 1920. Western Electric Company at Chicago, New 

 York, and Kearny, New Jersey, 1920-. As a development engineer, 

 Mr. Avery has helped establish efficient methods of manufacture for 

 enameled wire, paper and textile insulated wire, and telephone cable. 



D. R. Brobst, E.E., Lehigh University, 1917; First Lieutenant, 

 Coast Artillery Corps, U. S. Army, 1917-19; Engineering Department, 

 Western Electric Company, 1922-25; Bell Telephone Laboratories, 

 1925-. Mr. Brobst's work has been connected with the development 

 of central office wire and cable. 



R. W. Chesnut, A.B., Harvard University, 1917; War Depart- 

 ment of French Government, 1917; U. S. Army, 1917-19; Engineer- 

 ing Department, Western Electric Company, 1920-25; Bell Telephone 

 Laboratories, 1925-. Mr. Chesnut has been engaged in the develop- 

 ment of carrier telephone and long-wave radio systems. 



Hal F. Fruth, B.A., ALA., St. John's College, Minnesota, 1914; 

 M.S., University of Minnesota, 1922; Ph.D., University of Michigan, 

 1926; Research Assistant and Physics Instructor, University of Minne- 

 sota, 1920-22; Physics Instructor, University of Michigan, 1922-25; 

 Physicist, Western Electric Company, Development Department, 

 1925-. Dr. Fruth has been engaged in development of manufacturing 

 processes for mica condensers, microphones, resistances, wnre enameling 

 and gas burner design. 



W. S. Gorton, A.B., Johns Hopkins University, 1908; M.A., 1910; 

 Ph.D., 1914. Instructor in Electrical Engineering, Massachusetts 

 Institute of Technology, 1911-13; Physicist, Brady Urological Insti- 

 tute, Johns Hopkins Hospital, 1914-17; Associate Physicist, Bureau 

 of Standards, 1917-19; Western Electric Co., 1919-25; Bell Telephone 

 Laboratories, 1925-. Dr. Gorton has worked on voice-operated tele- 



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