530 BELL SYSTEM TECHNICAL JOURNAL 



K.\RL 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 — . At the Western Electric, Mr. 

 Darrow has been engaged largely in preparing studies and analyses 

 of published research in various fields of phNsics. 



H. H. Nanci-:, \\'ashini;ti)ii University, llHMi HI; Long Lines Plant 

 Department. 1910 23; district plant chief, 1917 18; dixision superin- 

 tendent of c(|uipment construction, 1919-20; dixision engineer, 

 1920-23; Long Lines Engineering Department, acting engineer of 

 transmission, 192.3; engineer of transmission, 1924. 



J. W. HoRlON. B.S., Massachusetts Institute of Technology, 1914; 

 instructor in physics, 1914-16; Engineering Department of the 

 Western Electric Company, 1916 — . Mr. Horton has been closely 

 connected with the dexelopmeni of apparatus for carrier current 

 communication. 



