434 BELL SYSTEM TECHNICAL JOURNAL 



J. B. Johnson, B.S., University of North Dakota, 1913; M.S., 

 University of North Dakota, 1914; Ph.D., Yale, 1917; Engineering 

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

 Laboratories, 1925-. Dr. Johnson has been engaged in the develop- 

 ment and application of special vacuum tubes and gaseous discharge 

 devices. 



Marrison, W. a., Royal Flying Corps, later Royal Air Force, 

 Canada, 1917-18; B.S. in Physics, Queens University, Canada, 

 1920; A.M. in Physics and Mathematics, Harvard University, 1921; 

 Western Electric Company, 1921-25; Bell Telephone Laboratories, 

 1925-. Mr. Marrison is engaged in the study of picture transmission 

 and methods for the production of constant frequency. 



E. J. Murphy, B.S., University of Saskatchewan, Canada, 1918; 

 McGill University, Montreal, 1919-20; Harvard University, 1922-23; 

 Engineering Department, Western Electric Company, 1923-25; Bell 

 Telephone Laboratories, 1925-. Mr. Murphy's work is largely 

 confined to the study of the electrical properties of textiles and of 

 electrical conduction in dielectrics in general. 



J. R. TowNSEND, Engineering Department, Western Electric 

 Company, 1919-25; Bell Telephone Laboratories, 1925-. Mr. 

 Townsend has been largely concerned with the testing of telephone 

 apparatus and more recently with the development of requirements of 

 test for metallic materials. 



R. R. Williams, B.S., University of Chicago, 1907, M.S., 1908; 

 Research Chemist, Bureau of Science, Philippine Islands, 1908-15; 

 Bureau of Chemistry, U. S. Department of Agriculture, 1915-18; 

 Engineering Department, Western Electric Company, 1918-25; Bell 

 Telephone Laboratories, 1925-. Mr. Williams has done extensive 

 research work on submarine cable insulation. Since 1925, as Chemical 

 Director, he has been in charge of the Chemical Laboratories of the 

 Research Department of the Bell Telephone Laboratories. 



W. T, WiNTRiNGHAM, B.S. in Electric Communication Engineering, 

 Harvard LIniversity, 1924; Department of Development and Research, 

 American Telephone and Telegraph Company, 1924-. Mr. Wintring- 

 ham's work has been largely along the line of long wave radio 

 transmission and measurement problems. 



E. B. Wood, B.S., Princeton University, 1915; M.A., Princeton, 

 1916; Teaching Staff, Cascadilla School, 1916-17; Captain, Coast 

 Artillery Corps, U. S. Army, 1917-19; Teaching Staff, Pratt 

 Institute, 1919-20; Engineering Department, Western Electric 

 Company, 1920-25; Bell Telephone Laboratories, 1925-. Mr. 

 Wood's work has been connected mainly with the development of 

 central ofifice wire and cable and humidity testing equipment. 



