CONTRIBUTORS TO THIS ISSUE 521 



phone Laboratories, 1925-. Mr. Lack has been engaged in experi- 

 mental work connected with radio communication. 



W. P. Mason, B.S. in Electrical Engineering, University of Kansas, 

 1921 ; M.A., Columbia University, 1924; Ph.D., 1928. Bell Telephone 

 Laboratories, 192 1-. Dr. Mason has been engaged in investigations 

 on carrier transmission systems and more recently in work on wave 

 transmission networks, both electrical and mechanical. 



R. C. Mathes, B.Sc, University of Minnesota, 1912; E.E., 1913. 

 Western Electric Company, Engineering Department, 1913-25. Bell 

 Telephone Laboratories, 1925-. Mr. Mathes has been concerned 

 with the early history of the repeater development program, the appli- 

 cation of vacuum tube amplifiers in a variety of fields, and the applica- 

 tion of voice controlled switching circuits in the toll telephone plant. 

 As Associate Wire Transmission Research Director he carries on in- 

 vestigations relating to the transmission of speech over wire systems. 



Pierre Mertz, A.B., Cornell University, 1918; Ph.D., 1926. 

 American Telephone and Telegraph Company, Department of De- 

 velopment and Research, 1919-23, 1926-34. Bell Telephone Labora- 

 tories, 1934-. Dr. Mertz has been engaged in special problems in toll 

 transmission, chiefly in telephotography, television, and cable carrier 

 systems. 



G. W. WiLLARD, B.A., University of Minnesota, 1924; M.A., 1928; 

 Instructor in Physics, University of Kansas, 1927-28; Student and 

 Assistant, LTniversity of Chicago, 1928-30. Bell Telephone Labora- 

 tories, 1930-. Mr. Willard's'work has had to do with special problems 

 in piezo-electric crystals for frequency control. 



S. B. Wright, M.E. in Electrical Engineering, Cornell University, 

 1919. Engineering Department and Department of Development and 

 Research, American Telephone and Telegraph Company, 1919-34. 

 Bell Telephone Laboratories, 1934-. Mr. Wright is engaged in trans- 

 mission development work on voice-operated systems and wire con- 

 nections to radio telephone stations. 



