CONTRIBUTORS TO THIS ISSUE 353 



Company, 1902-03; Chief Engineer, Missouri and Kansas Telephone 

 Company, 1903-12; Southwestern Bell Telephone Company, St. Louis, 

 Missouri, 191 2-, and for the last eighteen years its Chief Engineer. 

 Mr. Pennell has from time to time contributed articles to various tech- 

 nical iniblications. 



Arthur C. Peterson, Jr., B.S. in Electrical Engineering, Uni- 

 versity of Washington, 1928. American Telephone and Telegraph 

 Company, Department of Development and Research, 1928-34; Bell 

 Telephone Laboratories, 1934-. Mr. Peterson's work has been 

 primarily concerned with short-wave radio transmission development. 



Ralph Kimball Potter, B.S., Whitman College, 1917; Artillery 

 Corps, U. S. Army, 1917-19; E.E., Columbia University, 1923. 

 American Telephone and Telegraph Company, Department of De- 

 velopment and Research, 1923-34; Bell Telephone Laboratories, 

 1934-. Mr. Potter has been engaged in short-wave radio trans- 

 mission developmient work. 



S. A. ScHELKUNOFF, B.A., M.A. in Mathematics, The State College 

 of Washington, 1923; Ph.D. in Mathematics, Columbia University, 

 1928. Engineering Department, Western Electric Company, 1923-25. 

 Bell Telephone Laboratories, 1925-26. Department of Mathematics, 

 State College of Washington, 1926-29. Bell Telephone Laboratories, 

 1929-. Dr. Schelkunoff has been engaged in mathematical research, 

 especially in the field of electromagnetic theory. 



George C. Southworth, B.S., Grove City College, 1914; Sc.D. 

 (Hon.), 1931; Ph.D., Yale University, 1923. Assistant Physicist, 

 Bureau of Standards, 1917-18; Instructor, Yale University, 1918-23. 

 Editorial staff of Bell System Technical Journal, American Telephone 

 and Telegraph Company, 1923-24; Department of Development and 

 Research, 1924-34; Research Department, Bell Telephone Labora- 

 tories, 1934-. Dr. Southworth's work in the Bell System has been 

 concerned chiefly with the development of short-wave radio telephony. 

 He is the author of several papers on very high-frequency electrical 

 phenomena. 



