CONTRIBUTORS TO THIS ISSUE 373 



W. P. Mason, B.S., University of Kansas, 1921; M.A., Columbia, 

 1924; Engineering Department, Western Electric Company, 1921-24; 

 Bell Telephone Laboratories, Inc., 1925-. Mr. Mason has been 

 associated with work on carrier current communication, and more 

 recently with the development of filters and subscribers' sets. 



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

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

 mathematics. University of Chicago, 1917; Engineering Department, 

 Western Electric Company, 1917-24; Bell Telephone Laboratories, 

 Inc., 1925-. Mr. Darrow has been engaged largely in preparing 

 studies and analyses of published research in various fields of physics. 



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