The Contributors to this Issue 



William Wilson, Victoria University of Manchester, 1904-10; 

 M.Sc, 1908; Cavendish Laboratory, Cambridge University, 1910-12, 

 B.A.,1912; Lecturer in Physics, Toronto University, 1912-14; D.Sc 

 Manchester, 1913. Engineering Department W'estern Electric Com- 

 pany, 1914- . Dr. Wilson has pubHshed numerous papers on radio 

 activity and thermionics and since 1917 has been in direct charge of 

 vacuum tube design. 



George A. Campbell, B.S., Massachusetts Institute of Technology, 

 1891; A.B., Harvard, 1892; Ph.D., 1901; Gottingen, Vienna and 

 Paris, 1893-96. Mechanical Department, American Bell Telephone 

 Company, 1897; Engineering Department, American Telephone and 

 Telegraph Company, 1903-1919; Department of Development and 

 Research, 1919 — ; Research Engineer, 1908 — . Dr. Campbell has 

 published papers on loading and the theory of electric circuits and is 

 also well-known to telephone engineers for his contributions to re- 

 peater and substation circuits. The electric filter which is one of his 

 inventions plays a fundamental role in telephone repeater, carrier 

 current and radio systems. 



H. M. Trueblood, B.S., Earlham, 1902; Haverford, 1903; Massa- 

 chusetts Institute of Technology, 1908-09; Ph.D., Harvard, 1913; 

 aid and assistant United States Coast and Geodetic Survey, 1903-08; 

 assistant in physics, Harvard^ 1912-14; Joule-Thomson effect in 

 super-heated steam; instructor and assistant professor electrical 

 engineering, University of Pennsylvania, 1914-17; Department of 

 Development and Research, American Telephone and Telegraph Corn- 

 company, 1917 — ; work on inductive interference. 



J. J. PiLLiOD, E.E., Ohio Northern University, 1908; American 

 Telephone and Telegraph Company, Toledo Home Telephone Com- 

 pany, and Union Switch and Signal Company, short periods, 1904-08; 

 American Telephone and Telegraph Company, Long Lines Depart- 

 ment, 1908-11; Engineering Department, 1912-13; Division Plant 

 Engineer, Long Lines Department, 1914-17 ; Engineer of Transmission, 

 1918-19; Engineer, 1920-. As Engineer of the Long Lines Depart- 

 ment, Mr. Pilliod has been in general charge of engineering work in- 

 volved in the planning and installation of the newer sections of the 

 cable project described. 



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

 Research Department, Westinghouse Electric and Manufacturing 



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