COXTRIBUTORS TO THIS ISSUE 347 



pany and in 1918 joined the staff of the American Telephone and 

 Telegraph Company. He was made Equipment and Building Kngi- 

 neer in 1924, Acting Plant Engineer in 1928 and Plant Engineer in 1929. 



H. L. HuRER, Cornell University, 1909-13; Chesapeake and Poto- 

 mac Telephone Company and Associated Companies, 1913-17; 

 Signal Corps, U. S. Army, 1917-19; Chesapeake and Potomac Tele- 

 phone Company and Associated Companies. 1919-27; American Tele- 

 phone and Telegraph Company, Department of Operation and Engi- 

 neering, 1927-. Mr. Huber is now Engineer on Foreign Wire Relations. 



Herbert E. Ives, B.S., University of Pennsylvania, 1905; Ph.D., 

 Johns Hopkins, 1908; assistant and assistant physicist, Bureau of 

 Standards, 1908-09; physicist, Nela Research Laboratory, Cleveland, 

 1909-12 ; physicist, United Gas Improvement Company, Philadelphia, 

 1912-18; U. S. i\rmy Air Service, 1918-19; Western Electric Company 

 and Bell Telephone Laboratories, 1919 to date. As Director of Elec- 

 tro-Optical Research, Dr. Ives has to do principally with the produc- 

 tion, measurement and utilization of light in communication problems. 



J. C. Martin. Mr. Martin is associated with the Middle West 

 Utilities Company, Chicago, Illinois. 



Edward C. Molina, Engineering Department of the American 

 Telephone and Telegraph Company, 1901-19, as engineering assistant; 

 transferred to the Circuits Design Department to work on machine 

 switching systems, 1905; Department of Development and Research, 

 1919-. Mr. Molina has made contributions to the theory of proba- 

 bility and its applications to telephone problems, such as the efficiency 

 of various trunking arrangements and the significance of data derived 

 from samples. He has also taken out several important patents re- 

 lating to machine switching. 



R. F. Pack. Mr. Pack is Vice President and General Manager, 

 Northern States Power Company, Minneapolis, Minnesota. 



A. E. Silver. Mr. Silver is Consulting Electrical Engineer, Electric 

 Bond and Share Company, New York, N. Y. 



H- S. Warren, A.B., Stanford University, 1898. American Bell 

 Telephone Company 1899-1903; American Telephone and Telegraph 

 Company, 1902-. Department of Development and Research, 1919 

 to date; now Protection Development Engineer. Mr. Warren's work 

 has been chiefly of a development character in the field of transmission, 

 equipment, and electrical interference. 



