Contributors to this Issue 



Leonard Gladstone Abraham, B.S., 1922, M.S., 1923, University 

 of Illinois. American Telephone and Telegraph Company, Depart- 

 ment of Development and Research, 1923-. Mr. Abraham has been 

 engaged in transmission development work on toll telephone systems. 



E. M. BoARDMAN. Attended Parsons College and Iowa University, 

 1923-26; Physics Department, Vale University, 1927-28. Bell Tele- 

 phone Laboratories, 1929-. Mr. Boardman has been engaged in 

 studies of submarine cable interference. 



E. T. Burton, A.B., 1920, M.A., 1924, Indiana University. Lieu- 

 tenant, U. S. Engineers' Corps, 1917-18. Research Department, 

 Western Electric Company, and Bell Telephone Laboratories, 1920-. 

 Mr. Burton has been engaged in research connected with low frequency 

 and carrier frequency signaling systems. 



R. F. Davis, B.E.E., Cornell University, 1921. American Tele- 

 phone and Telegraph Company, Department of Operation and Engi- 

 neering, 1921-. Mr. Davis' work has been largely concerned with the 

 electrical protection of communications circuits and with the electrical 

 coordination of such circuits with power transmission and distribution 

 circuits. 



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

 1916; Research Assistant in Physics, 1915-16. Engineering Depart- 

 ment, Western Electric Company, 1917-25; Bell Telephone Labora- 

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

 development of methods of electrical measurement. 



Harvey Fletcher, B.Sc, Brigham Young University, 1907; Ph.D., 

 University of Chicago, 1911; Instructor of Physics, Brigham Young 

 University, 1907-08, and University of Chicago, 1909-10; Professor, 

 Brigham Young University, 1911-16. Engineering Department, 

 Western Electric Company, 1916-25; Bell Telephone Laboratories, 

 1925-. As Acoustical Research Director, Dr. Fletcher is in charge of 

 investigations in the fields of speech and audition. 



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