Contributors to this Issue 



O. B. Blackwell, B.S. in electrical engineering, Massachusetts 

 Institute of Technology. After graduation, he entered the Engineering 

 Department of the American Telephone and Telegraph Company and 

 in 1919 was made Transmission Development Engineer. Mr. Black- 

 well has general supervision of transmission developments and has 

 been prominently associated with progress in long distance wire and 

 radio telephony. 



R, N. CoNWELL. Mr. Conwell is Transmission and Substation 

 Engineer, Public Service Electric and Gas Company, Newark, New 

 Jersey. 



Lloyd Espenschied. Mr. Espenschied is High Frequency Trans- 

 mission Engineer, Department of Development and Research, Ameri- 

 can Telephone and Telegraph Company. He joined the Bell System 

 in 1910, having graduated from Pratt Institute the previous year. 

 He has taken an important part in practically all of the Bell System 

 radio developments, beginning with the first long-distance radio-tele- 

 phone tests of 1915, at which time he received the voice in Hawaii from 

 Arlington, Va. He has participated in a number of international 

 conferences on electric communications. 



Bancroft Gherardi, B.Sc, Polytechnic Institute, Brooklyn, N. Y., 

 1891; M. E., Cornell University, 1893; M.M.E., Cornell University, 

 1894. New York Telephone Company, Engineering Assistant, 1895- 

 99; Traffic Engineer, 1899-1900. New York and New Jersey Tele- 

 phone Company, Chief Engineer, 1900-06. New York Telephone 

 Company, and New York and New Jersey Telephone Company, 

 Assistant Chief Engineer, 1906-07. American Telephone and Tele- 

 graph Company, Equipment Engineer, 1907-09; Engineer of Plant, 

 1909-18; Acting Chief Engineer, 1918-19; Chief Engineer, 1919-20; 

 Vice President and Chief Engineer, 1920-. Mr. Gherardi is a Past 

 President of the American Institute of Electrical Engineers and is now 

 President of the American Standards Association. 



William H. Harrison, Plant Engineer, American Telephone and 

 Telegraph Company. Mr. Harrison entered the Bell System in 1909 

 as a repairman for the New York Telephone Company. In 1915 he 

 became engaged in circuit design work with the Western Electric Com- 



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