Contributors to this Issue 



O. B. Blackwell, B.S. in electrical engineering, Massachusetts 

 Institute of Technology. After graduation, he entered the Engineer- 

 ing Department of the American Telephone and Telegraph Company 

 as engineer and in 1919 was made Transmission Development Engineer. 



Mr. Blackwell has general supervision of transmission developments 

 and by virtue of his position has been prominently associated with 

 progress in long distance wire and radio telephony. 



K. W. Waterson, S.B. in E.E., Massachusetts Institute of Tech- 

 nology, 1898; Mechanical Department, American Bell Telephone 

 Company, 1898; in charge of equipment engineering, 1901 ; in charge of 

 traffic engineering, 1905; in charge of traffic and equipment engineer- 

 ing, 1906; Assistant Chief Engineer, 1907; Engineer of Traffic, 1909; 

 Executive Officer, Department of Development and Research, 1919; 

 Assistant Chief Engineer, Department of Operation and Engineering, 

 1920; Assistant Vice President, 1927, in charge of traffic, plant opera- 

 tion and general results divisions, Department of Operation and 

 Engineering. 



Sallie Pero Mead, A.B., Barnard College, 1913; M.A., Columbia 

 University, 1914; American Telephone and Telegraph Company, 

 Engineering Department, 1915-19; Department of Development and 

 Research, 1919-. Mrs. Mead's work has been of a mathematical 

 character relating to telephone transmission. 



Oliver E. Buckley, B.Sc, Grinnell College, 1909; Ph.D., Cornell 

 University, 1914; Engineering Department, Western Electric Com- 

 pany, 1914-17; U. S. Army Signal Corps, 1917-18; Engineering De- 

 partment, Western Electric Company (Bell Telephone Laboratories), 

 1918-. During the war Major Buckley had charge of the research 

 section of the Division of Research and Inspection of the Signal Corps, 

 A. E. F. His early work in the Laboratories was concerned princi- 

 pally with the production and measurement of high vacua and with 

 the development of vacuum tubes. More recently he has directed in- 

 vestigations of magnetic materials and the development of the per- 

 malloy-loaded submarine cable. 



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