The Contributors to this Issue 



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

 Research Department, Westinghouse Electric and Manufacturing 

 Company; 1910-12; instructor of physics and electrical engineering, 

 Princeton, 1912-14; American Telephone and Telegraph Company, 

 Engineering Department, 1914-15; Patent Department, 1916-17; 

 Engineering Department, 1918; Depaitment of Development and 

 Research, 1919 — . Mr. Carson's work has been along theoretical lines 

 and he has published several papers on theory of electric circuits and 

 electric wave propagation. 



Otto J. Zobel, A.B., Ripon College, 1909; A.M., Wisconsin, 1910; 

 Ph.D., 1914; instructor in physics, 1910-15; instructor in physics, 

 Minnesota, 1915-16; Engineering Department, American Telephone 

 and Telegraph Company, 1916-19; Department of Development and 

 Research, 1919 — . Mr. Zobel has made important contributions to 

 circuit theory in branches other than the subject of wave-filters. 



J. N. Kirk, B.S., Purdue University, 1905; Engineering Depart- 

 ment, New York Telephone Company, 1905-11; Plant Engineer for 

 Texas, Southwestern Bell Telephone Company, 1912; Outside Plant 

 Engineer, 1913-16; Engineering Department, American Telephone 

 and Telegraph Company, 1917-19; Outside Plant Engineer, Depart- 

 ment of Operation and Engineering, 1920 — . 



Helene C. Bateman, A.B., Barnard, 1917; Department of Oper- 

 ation and Engineering, American Telephone and Telegraph Company, 

 1917 — . Mrs. Bateman has been engaged in research work relating 

 to commercial engineering. 



H. D. Arnold, Ph.B., Wesleyan, 1906; M.S., 1907; Ph.D., Chicago, 

 1911; assistant in physics, Wesleyan, 1906-07; Chicago, 1908; pro- 

 fessor, Mt. Allison, 1909-10; Engineering Department of the Western 

 Electric Company, Research Engineer, 1911 — ; Director of Research, 

 1923 — . Dr. Arnold has been in direct charge of the development of 

 the vacuum tube for telephone repeaters and radio purposes, and 

 also other items of telephone equipment. 



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

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



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