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Contributors to this Issue 



F. H. Best, M.E., Cornell University, 1911; Engineering Depart- 

 ment and Department of Development and Research, American Tele- 

 phone and Telegraph Company, 191 1-. Mr. Best has been engaged 

 principally in the development of testing apparatus used in maintaining 

 the transmission efficiency of telephone circuits. 



A. M. Curtis came to the Engineering Department of the Western 

 Electric Company in 1913 after having spent several years as radio 

 engineer for the Brazilian Government. During the World War he 

 was commissioned and sent to France to serve in the Division of Re- 

 search and Inspection of the Signal Corps. In 1919, he returned to 

 Bell Telephone Laboratories and has since been engaged in the applica- 

 tion of vacuum tube amplifiers to submarine cables and in the develop- 

 ment of oscillographs and associated apparatus useful in the study of 

 the problems of electrical communication. 



Karl K. Darrow, B.S., University of Chicago, 1911; University 

 of Paris, 1911-12; University of Berlin, 1912; Ph.D., University of 

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

 Laboratories, 1925-. Dr. Darrow has been engaged largely in writing 

 on various fields of physics and the allied sciences. 



L. S. Ford, B.S., Worcester Polytechnic Institute, 1905; E.E., 1906. 

 Western Electric Company, 1909-1924; Bell Telephone Laboratories, 

 1925-. Mr. Ford has been associated almost continuously with cable 

 development, most of the time as a representative of the Laboratories 

 at Hawthorne and at Kearny. 



Ray S. Hoyt, B.S., in Electrical Engineering, University of Wiscon- 

 sin, 1905; Massachusetts Institute of Technology, 1906; M.S., Prince- 

 ton, 1910. American Telephone and Telegraph Company, Engineer- 

 ing Department, 1906-07. Western Electric Company, Engineering 

 Department, 1907-11. American Telephone and Telegraph Company, 

 Engineering Department, 1911-19; Department of Development and 

 Research, 191 9-. Mr. Hoyt has made contributions to the theory of 

 transmission lines and associated apparatus, theory of crosstalk and 

 other interference, and probability theory with particular regard to its 

 applications in telephone transmission engineering. 



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