Contributors to this Issue 



Millard W. Baldwin, Jr., E.E., Cornell, 1925; M.A., Columbia, 

 1928; Bell Telephone Laboratories, 1925- Mr. Baldwin has been 

 engaged in studies of vacuum tube modulation ; more recently his work 

 has had to do with some of the problems of picture transmission and 

 television. 



David George Blattner, B.S.E.E., Kansas State Agricultural 

 College, 1911; Assistant Instructor in Physics, Kansas State Agri- 

 cultural College, 1911-13. Engineering Department, Western Elec- 

 tric Company, 1914-25. Bell Telephone Laboratories 1925-. Mr. 

 Blattner's work has been in loud speaker, public address systems, and 

 phonograph recorder and reproducer developments. 



L. G. BosTWiCK, B.S. in E.E., University of Vermont, 1922; Amer- 

 ican Telephone and Telegraph Company, Development and Research 

 Department, 1922-26; Bell Telephone Laboratories, Inc., Research 

 Department, 1926-. While with the Development and Research 

 Department, Mr. Bostwick's work involved general problems on 

 systems for the high quality transmission of speech and music; since 

 then his work has been largely on loud speakers and loud speaker 

 measuring methods. 



S. Brand, B.S., Trinity College, 1915; Yale LTniversity Graduate 

 School, 1915-17; U. S. Air Service, 1917-19; Plant Department, 

 Southern New England Telephone Company, 1920-23; Department 

 of Development and Research, American Telephone and Telegraph 

 Company, 1923-. Mr. Brand has been engaged mainly in transmis- 

 sion development work on repeatered circuits. 



A. B. Clark, B.E.E., University of Michigan, 1911; American Tele- 

 phone and Telegraph Company, 191 1-. Toll Transmission Develop- 

 ment Engineer, 1928-. Mr. Clark's work has been largely concerned 

 with toll telephone and telegraph systems. 



Lloyd Espenschied. Mr. Espenschied is in charge of radio devel- 

 opment, assisting the Transmission Development Engineer, Depart- 

 ment of Development and Research, American Telephone and Tele- 

 graph Company. He joined the Bell System in 1910, having graduated 

 from Pratt Institute the previous year. He has taken an important 

 part in practically all of the Bell System radio developments, beginning 

 with the first long-distance radio-telephone tests of 1915, at which time 



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