CONTRIBUTORS TO THIS ISSUE 521 



1942. He then became an instructor in the Laboratories' School for War 

 Training. From 1945-51, he taught switching circuit design. Since 1951, 

 in the switching engineering group, he has been working out new tech- 

 niques for measuring telephone traffic in central offices. Co-author of 

 The Design of Switching Circuits with W. Keister and S. H. Washburn 

 (Van Nostrand, 1951). Member of the A.I.E.E. 



H. A. Stone, Jr., B.S., Yale University, 1933. Bell Telephone Labora- 

 tories, 1936-. A member of the Transmission Development Department, 

 Mr. Stone is in charge of a group engaged in the development of induc- 

 tors and loading coils and cases. He previously assisted in the develop- 

 ment of inductors and networks for use in military radio and telephone 

 projects, and the design of radar pulse generators. Member of the 

 A.I.E.E. 



Roger I. Wilkinson, B.S. in E.E., 1924, Professional Engineer (hon- 

 orary), 1950, Iowa State College; Northwestern Bell Telephone Company, 

 1920-21; American Telephone and Telegraph Company, 1924-34; Bell 

 Telephone Laboratories, 1934-43 and 1946-. U. S. War Department, 

 Washington and South Pacific, 1943-45. Mr. Wilkinson has been en- 

 gaged in applications of the mathematical theory of probability to 

 telephone problems. Medal for Merit, 1946. Member of A.S.E.E. ; A.S.A. ; 

 Institute of ^lathematical Statistics; American Society for Quality 

 Control; Fellow, Operations Research Society of America; Associate 

 Member of A.I.E.E.; and Member of Eta Kappa Nu; Tau Beta Pi; Phi 

 Kappa Phi; and Pi Mu Epsilon. 



