Contributors to this Issue 



Charles W. Carter, Jr., A.B., Harvard, 1920; B.Sc, Oxford, 1923. 

 American Telephone and Telegraph Company, Department of De- 

 velopment and Research, 1923-. Mr. Carter's work has had to do 

 with the theory of electrical networks and with problems of telephone 

 quality. 



T. G. Castner, B.S. in Electrical Engineering, Drexel Institute, 

 1925. Bell Telephone Laboratories, 1926-. Mr. Castner's work has 

 been concerned with studies of transmission quality and with the 

 development of transmission testing apparatus and methods. 



A. B. Clark, B.E.E., University of Michigan, 1911. American 

 Telephone and Telegraph Company, 191 1-. Toll Transmission De- 

 velopment Engineer, 1928-. Mr. Clark's work has been largely con- 

 cerned with toll telephone and telegraph systems. 



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

 of Paris, 1911-12; University of BerUn, 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. 



J. W. Emling, B.S. in Electrical Engineering, University of Penn- 

 sylvania, 1925. American Telephone and Telegraph Company, De- 

 partment of Development and Research, 1925-. Mr. Emling has been 

 engaged in development work in connection with the transmission of 

 exchange area circuits. 



Ronald M. Foster, S.B., Harvard, 1917. American Telephone 

 and Telegraph Company, Engineering Department, 1917-19; Depart- 

 ment of Development and Research, 1919-. Mr. Foster has been 

 working upon various mathematical problems connected with the 

 theory of electrical networks. 



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

 Instructor in Physics at Massachusetts Institute of Technology, 

 Barnard College, and Columbia University, 1906-1913. Engineering 

 Department of the Western Electric Company, 1913; Bell Telephone 

 Laboratories, 1925-. Mr. Kendall's early work was on repeaters in 



375 



