1512 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1957 



Gerald Kronacher, Dipl. Eng., Federal Institute of Technology, 

 Zurich, Switzerland, 1937; Assistant Professor, Federal Institute of 

 Technology, 1938; mining engineer, Bolivia, 1939-1946; General Electric 

 Company, 1946-1948; Air Associates, Inc., 1948-1951; Arma Corpora- 

 tion, 1951-1953; Bell Telephone Laboratories, 19513-. Since joining the 

 Laboratories Mr. Kronacher has been associated with the Military Sys- 

 tems Engineering Department studying input and output problems for 

 digital computers. He is the author of many published technical articles. 



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

 can Telephone and Telegraph Company, 1919-1921, 1926-1934; Bell 

 Telephone Laboratories, 1935-. Mr. Mertz 's work with the Bell Sys- 

 tem has been concerned primarily with transmission problems relating to 

 telephotography and television. Since 1950 Mr. Mertz has acted as a 

 consultant in the Systems Engineering Department on such projects as 

 micro-image readers and commercial and military data transmission 

 problems. Fellow of the I.R.E. and the Society of Motion Picture and 

 Television Engineers; member, American Physical Society, Optical 

 Society of America and the Inter-Society Color Council. 



DoREN Mitchell, B.S., Princeton University, 1925; American Tele- 

 phone and Telegraph Company, 1925-1934; Bell Telephone Labora- 

 tories, 1934-. Mr. Mitchell's early work with the Bell System was con- 

 cerned with field studies of transmission on long telephone circuits and 

 radio circuits, including supervision of the initial operation of the New 

 York to Buenos Aires radio-telephone circuit. Until 1942 Mr. Mitchell 

 worked on voice operated devices of various kinds including compandors, 

 echo suppressors and automatic switching devices. During World War 

 II he participated in military projects involving transmission systems 

 and problems of laying wire from airplanes. Since the war Mr. Mitchell 

 has been primarily concerned with radio systems. In 1955 he was ap- 

 pointed a Special Systems Engineer supervising a data transmission 

 system for the SAGE project, and planning other special services in- 

 volving radio. Mr. Mitchell has been granted over seventy patents. Mem- 

 ber I.R.E. 



R. C. Prim, B.S. in E.E., University of Texas, 1941; A.M., Ph.D., 

 Princeton LTni versify, 1949; General Electric Company, 1941-1944; 

 Naval Ordnance Laboratory, 1944-1948; Bell Telephone Laboratories, 

 1949-. Since joining the Laboratories Mr. Prim has been a member of 

 the Mathematical Research Department engaged in research and con- 



