CONTRIBUTORS TO THIS ISSUE 325 



O. J. Murphy, B.S. in ELlectrical Engineering, University of Texas, 

 1927; Columbia l^niversity, 1928-31. Bell Telephone Laboratories, 

 1927 . Mr. Murphy has been principally engaged in studies of the 

 effects of transmission delay and voice operated devices on toll tele- 

 phone circuits. 



A. C. NoRwiNE, A.B., University of Missouri, 1923; B.S. in Elec- 

 trical Engineering, 1924; E.E., 1925. Bell Telephone Laboratories, 

 1925-. Mr. Norwine has been principally engaged in studies of the 

 effects of transmission delay and voice operated devices on toll tele- 

 phone circuits. 



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