CONTRlPirrORS TO THIS ISSUE 661 



Frances Thorndike, A.B., Vassar College, 1922; M.A., Columbia 

 l^niversity, 1925, American Telephone and Telegraph Company, 

 Department of De\elopment and Research, 1922 — . 



S. D. WiLBURN — Long Lines Department of the American Tele- 

 phone and Telegraph Company, 190-4-192G; Line Construction, 1904- 

 1906; Line Maintenance, 1906-1909; Equipment Maintenance, 1909- 

 1912; Special Contract Service and Plant Maintenance, 1912-1918; 

 Telephone Transmission Maintenance, 1918-1922; Telegraph En- 

 gineering, 1922-1926. 



H. \V. Hitchcock, B.S., Pomona College, 1911; Cornell University, 

 1911-13; Engineering Department of American Telephone and Tele- 

 graph Company, 1913-19; Department of Development and Research, 

 1919-21 ; The Pacific Telephone and Telegraph Company, Engi- 

 neering Department, 1921-24; Transmission and Protection En- 

 gineer, Southern California Telephone Company, 1924 — . Mr. 

 Hitchcock's work prior to 1921 was in connection with inductive 

 interference and submarine cable transmission development prob- 

 lems; his later work has been in connection with the transmission 

 activities of one of the operating companies. 



