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 Western Electric Company, 1914- . Dr. Wilson has published 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; Göttingen, Vienna and Paris, 1893-96. Mechanical Department, American Bell Telephone 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 repeater 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; Massachusetts Institute of Technology, 1908-09; Ph.D., Harvard, 193; 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 Company, 1917—; work on inductive interference.
J. J. Pilliod, E.E., Ohio Northern University, 1908; American Telephone and Telegraph Company, Toledo Home Telephone Company, and Union Switch and Signal Company, short periods, 1904-08; American Telephone and Telegraph Company, Long Lines Department, 1908-11; Engineering Department, 1912-1913; Division Plant Engineer, Long Lines Department, 1914-17; Engineer of Transmission, 1918-19; Engineer, 1920-. As Engineer of the Long Lines Department, Mr. Pilliod has been in general charge of engineering work involved in the planning and installation of the newer sections of the cable project described.
John R. Carson, B.S., Princeton, 1907; E.E., 1909; M.S., 1912: Research Department, Westinghouse Electric and Manufacturing
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