CONTRIBUTORS TO THIS ISSUE 551 



ment and Research, 1919-34. Bell Telephone Laboratories, 1934-. 

 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. 



Sallie Pero Mead, A.B., Barnard College, 1913; M.A., Columbia 

 University, 1914. American Telephone and Telegraph Company, 

 Engineering Department, 1915-19; Department of Development and 

 Research, 1919-34. Bell Telephone Laboratories, 1934-, Mrs. 

 Mead's work has been of a mathematical character relating to tele- 

 phone transmission. 



William W. Mumford, B.A., Willamette University, 1930. Bell 

 Telephone Laboratories, 1930-. Mr. Mumford has been engaged in 

 radio receiving work, chiefly on the problem of propagation and 

 measurement in the ultra-short-wave region. 



F. A. PoLKiNGHORN, B.S., University of California, 1922; U.S. 

 Naval Radio Laboratory at Mare Island Navy Yard, California, 

 1922-24; A-P Radio Laboratories, San Francisco, 1924-25. Pacific 

 Telephone and Telegraph Company, San Francisco, 1925-27; Bell 

 Telephone Laboratories, 1927-. Mr. Polkinghorn's work has been 

 primarily in connection with the design of radio receiving and test 

 equipment for use at high and ultra-high frequencies. 



N. F. ScHLAACK, B.S., University of Michigan, 1925. Bell Tele- 

 phone Laboratories, 1925-. Mr. Schlaack has been engaged pri- 

 marily in the development of short and ultra-short-wave transrnitting 

 equipment. 



E. C. Wente, A.B., University of Michigan, 1911 ; S.B. in Electrical 

 Engineering, Massachusetts Institute of Technology, 1914; Ph.D., 

 Yale University, 1918. Engineering Department, Western Electric 

 Company, 1914-16 and 1918-24; Bell Telephone Laboratories, 1924-. 

 As Research Physicist, Dr. Wente has worked principally on general 

 acoustic problems and on the development of special types of acoustic 

 devices. 



