520 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1953 



work has included the study, correlation, and representation of scientific 

 information for his colleagues, keeping them informed of current ad- 

 vances made by workers in fields related to their own activities. As a 

 corollary to his work. Dr. Darrow appears from time to time before 

 scientific and lay audiences to lecture on current topics in physics and 

 the related sciences. He has taken an active interest in education, teach- 

 ing physics during summer and other sessions at Stanford, Chicago, and 

 Columbia Universities and at Smith College. From 1944 to 1946, he 

 served as consultant to the Metallurgical Laboratory in Chicago. Dr. 

 Darrow is the author of Introduction to Contemporary Physics (1939), 

 Electrical Phenomena in Gases (1932), Renaissance of Physics (1936), 

 Atomic Energy (1948). He is a member of the American Physical Society, 

 which he has served as secretary since 1941, the Physical Society of 

 London, Soci^t^ Francaise de Physique, the American Philosophical 

 Society, of which he was a counsellor for four years, and the International 

 Union of Pure and Applied Physics, of which he was vice president from 

 1947 to 1951. In 1949 he received an honorary doctorate from the Uni- 

 versity de Lyon. 



George R. Frost, Bell Telephone Laboratories, 1943-. Mr. Frost 

 has had over twenty-three years of service with the Bell System. Since 

 1943 he has been an instructor at the Laboratories' School for War 

 Training and in the Communications Development Training Program, 

 until recently when he became a member of the Publication Depart- 

 ment's group responsible for displays. From 1941-43 he taught communi- 

 cations at Fenn College, and from 1946-47 mathematics at Pratt 

 Institute. 



William Keister, B.S. in E.E., Alabama Polytechnic Institute, 

 1930; Bell Telephone Laboratories, 1930-32 and 1936-. As a member of 

 the switching department, he is currently preparing text material and 

 teaching general switching circuit theory and telephone switching sys- 

 tems to members of the technical staff. Co-author of The Design of 

 Switching Circuits, with S. H. Washburn and A. E. Ritchie (Van No- 

 strand, 1951). Member of A.I.E.E., Eta Kappa Nu, Tau Beta Pi, and 

 Phi Kappa Phi. 



Alistair E. Ritchie, A.B., Dartmouth College, 1935; M.A., Dart- 

 mouth College, 1937. Bell Telephone Laboratories, 1937-. As a member 

 of the switching development group, Mr. Ritchie tested panel and cross- 

 bar circuits and made noise studies on panel and crossbar systems until 



