Contributors to this Issue 



John R. Carsox, B.S., Princeton, 1907; E.E., 1909; M.S., 1912; 

 American Telephone and Telegraph Company, 1914-. Mr. Carson 

 is well known through his theoretical transmission studies and has 

 published extensively on electric circuit theory and electric wave 

 propagation. 



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. Some of his earlier 

 articles on Contemporary Physics form the nucleus of a recently 

 published book entitled "Introduction to Contemporary Physics" 

 (D. V^an Nostrand Company). A recent article has been translated 

 and published in Germany under the title "Einleitung in die Wellen- 

 mechanik." 



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. 



Frank B. Jewett, A.B., California Institute of Technology, 1898; 

 Ph.D., University of Chicago, 1902. American Telephone and Tele- 

 graph Company, Transmission and Protection Engineer, 1904-12. 

 Western Electric Company, Assistant Chief Engineer, 1912-16; Chief 

 Engineer, 1916-21; Vice President and Chief Engineer, 1921-22; 

 Vice President, 1922-25. International Western Electric Company, 



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