252 BELL SYSTEM TECHNICAL JOURNAL 



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. 



Lloyd Espenschied, Pratt Institute, 1909, has taken an important 

 part in much of the Bell System's invention and development in the 

 field of radio and carrier currents; also in technical contacts and inter- 

 national conferences abroad. Previously, in the Department of 

 Development and Research of the American Telephone and Telegraph 

 Company; now, as Research Consultant of the Bell Telephone 

 Laboratories, participates in a broad front of electric-communications 

 development. 



Frank Gray, B.S., Purdue, 1911; Ph.D., University of Wisconsin, 

 1916. Western Electric Company, Engineering Department, 1919-25. 

 Bell Telephone Laboratories, 1925-. Dr. Gray has been engaged in 

 work on electro-optical systems. 



William H. Harrison, Vice President and Chief Engineer, American 

 Telephone and Telegraph Company. Pratt Institute, graduate in 

 Industrial Electrical Engineering, 1915. New York Telephone Com- 

 pany, repairman, apparatus inspector, 1909-14. Western Electric 

 Company, engineer, 1914-18. American Telephone and Telegraph 

 Company, 1918-33, Department of Operation and Engineering, 

 engineer; Equipment and Building Engineer; Plant Engineer. Bell 

 Telephone Company of Pennsylvania, Diamond State Telephone 

 Company, Vice President in charge of Operations, 1933-37. Amer- 

 ican Telephone and Telegraph Company, Department of Operation 

 and Engineering, Assistant Vice President, 1937-38; Vice President 

 and Chief Engineer, 1938-. 



L. W. HussEY, A.B., Dartmouth, 1923; M.A., Harvard, 1924; B.S. 

 in E.E., Union College, 1930; Mathematics Department, Union 

 College, 192^29. Bell Telephone Laboratories, 1930-. Mr. Hussey 

 has been engaged principally in work on the stability of regenerative 

 systems and on modulation in non-linear resistances. 



B. W. Kendall, S.B., Massachusetts Institute of Technology, 1906; 

 Instructor in Physics at Massachusetts Institute of Technology, 

 Barnard College, and Columbia University, 1906-13. Engineering 

 Department of the Western Electric Company, 1913; Bell Telephone 

 Laboratories, 1925-. As Toll Development Director Mr. Kendall has 

 charge of the development of carrier, voice frequency, and telegraph 



