Contributors to this Issue 



C. J. Davisson, B.Sc, University of Chicago, 1908; Ph.D., Princeton 

 University, 1911; Instructor in Physics, Carnegie Institute of Tech- 

 nology, 1911-17; Engineering Department of the Western Electric 

 Company, 1917-25; Bell Telephone Laboratories, 1925-. Dr. 

 Davisson's work since coming with the Bell System has related largely 

 to thermionics and electronic physics. 



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

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

 Engineering Department of the Western Electric Company, 1906-25; 

 Bell Telephone Laboratories, 1925-. Mr. Elmen's principal line of 

 work has been magnetic investigations. He is the inventor of the 

 permalloy alloys. For this he was awarded the John Scott Medal in 

 1926 and the Elliott Cresson Medal in 1928. 



J. G. Ferguson, B.Sc, University of California, 1915; M.Sc, 1916; 

 Research Assistant in Physics, 1915-16; Engineering Department, 

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

 1925-. Mr. Ferguson's work has been in connection with the develop- 

 ment of methods of electrical measurement. 



L. H. Germer, A.B., Cornell, 1917; M.A., Columbia, 1922; Ph.D., 

 Columbia, 1927; Engineering Department, Western Electric Com- 

 pany, 1917-1925; United States Army, 1917-1919; Bell Telephone 

 Laboratories, 1925-. Dr. Germer has been engaged chiefly upon 

 work in thermionics and electron scattering. 



C. H. G. Gray, B.Sc, Massachusetts Institute of Technology, 

 1918; Instructor, Electrical Engineering, Massachusetts Institute of 

 Technology, 1918-19; Engineering Department, Western Electric 

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

 in addition to his work on the master reference system, has been 

 engaged in the development and application of machine testing 

 methods for the inspection of transmitters and receiv^ers. 



Charles H. Greenall, M.E., Lehigh University, 1922; Engineering 

 Department, Western Electric Company, 1922-25; Bell Telephone 

 Laboratories, 1925-. Mr. Greenall's work has involved investigation 

 of telephone apparatus, and testing methods as applied to specification 

 requirements and development of metallic materials. 



F. R. Lack, B.Sc, Harvard, 1925; Engineering Department, 

 Western Electric Company, 1913-22; First Lieutenant, Signal 



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