Contributors to this Issue 



Walter L. Bond, B.S. in Physics, Washington State College, 1927; 

 M.S. 1928. Member of Technical Staff, Bell Telephone Laboratories 

 1928-. Studied at Columbia University, New York University, and 

 Stevens Institute. Engaged primarily in studies of the physical properties 

 of crystals. 



L. A. MacColl, A.B., University of Colorado, 1919; A.M., Columbia 

 University, 1925; Ph.D., Columbia University, 1934. Engineering De- 

 partment, Western Electric Company, 1919-25; Bell Telephone Laborator- 

 ies, 1925-. Dr. MacColl is engaged in research in mathematics and mathe- 

 matical physics. 



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 systems and in work on wave transmission networks both electrical 

 and mechanical. He is now head of the department investigating piezo- 

 electric crystals. 



J.R. Pierce, B.S. in Electrical Engineering, California Institute of 

 Technology, 1933; Ph.D., 1936. Bell Telephone Laboratories, 1936-. 

 Engaged in study of vacuum tubes. 



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