Contributors to this Issue 



Karl K. Darrow, B.S., University of Chicago, 1911 ; University of 

 Paris, 1911-12; University of Berlin, 1912; Ph.D., University of 

 Chicago, 1917. Western Electric Company, 1917-25; Bell Telephone 

 Laboratories, 1925-. Dr. Darrow has been engaged largely in writing 

 on various fields of physics and the allied sciences. 



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 investi- 

 gating piezoelectric crystals. 



A. L. Matte, B.S. in Electrical Engineering, Massachusetts Insti- 

 tute of Technology, 1909; Graduate Studies, M.LT., 1912-13. New 

 England Investment and Securities Company, 1910-12; Detroit 

 United Railways, 1913-18. American Telephone and Telegraph 

 Company, Department of Development and Research, 1918-34; Bell 

 Telephone Laboratories, 1934r-. Mr. Matte has been engaged prin- 

 cipally in transmission studies relating to carrier telegraphy. 



G. S. Phipps, B.S. in Electrochemical Engineering, Pennsylvania 

 State College, 1930; M.S. in Metallurgy, Columbia University, 1939. 

 Bell Telephone Laboratories, 1930-. Mr. Phipps has been engaged 

 principally in the metallurgical investigation of solders and lead base 

 alloys. 



F. A. PoLKiNGHORN, B.S., University of California, 1922; U. S. 

 Naval Radio Laboratory at Mare Island Navy Yard, California, 

 1922-24; A-P Radio Laboratories, San Francisco, 1924-25. Pacific 

 Telephone and Telegraph Company, San Francisco, 1925-27; Bell 

 Telephone Laboratories, 1927-. Mr. Polkinghorn's work has been 

 primarily in connection with the design of radio receiving and test 

 equipment for use at high and ultra-high frequencies. 



Earle E. Schumacher, B.S., University of Michigan; Research 

 Assistant in Chemistry, 1916-18. Engineering Department, Western 

 Electric Company, 1918-25; Bell Telephone Laboratories, 1925-. As 



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