218 BELL SYSTEM TECHNICAL JOURNAL 



Physics, University of Colorado, 1921-1922. Department of Development 

 and Research, American Telephone and Telegraph Company, 1922-27; 

 Bell Telephone Laboratories, 192 7-. Mr. Ohl has been engaged in various 

 exploratory phases of radio research, the results of which have led to nu- 

 merous patents. For the past ten or more years he has been working on 

 some of the problems encountered in the use of millimeter radio waves. 



G. L. Pearson, A. B., Willamette University, 1926; M. A. in Physics, 

 Stanford University, 1929. Bell Telephone Laboratories, 1929-. Mr. 

 Pearson is in the Physical Research Department where he has been engaged 

 in the study of noise in electric circuits and the properties of electronic semi- 

 conductors. 



J. H. ScAFF, B.S.E. in Chemical Engineering, University of Michigan, 

 1929. Bell Telephone Laboratories, 1929-. Mr. Scaff's early work in the 

 Laboratories was concerned with metallurgical investigations of impurities 

 in metals with particular reference to soft magnetic materials. During the 

 war he was project engineer for the development of silicon and germanium 

 crystal rectifiers for radar applications. At the present time, he is re- 

 sponsible for metallurgical work on varistor and magnetic materials. 



I. G. Wilson, B.S. and M.E., University of Kentucky, 1921. Western 

 Electric Co., EngineeringDepartment, 1921-25. Bell Telephone Labora- 

 tories, 1925-. Mr. Wilson has been engaged in the development of am- 

 plifiers for broad-band systems. During the war he was project engineer in 

 charge of the design of resonant cavities for radar testing. 



