THE BELL SYSTEIM 



/ 



mcai ourna 



devoted to the scientific ^^^ and engineerinc 

 Aspects of electrical communication 



rOLUME XXXII MARCH 1953 NUMBER: 



Ferrite Core Inductors h. a. stone, jr. 265 



A Tlirowdown Machine for Telephone Traffic Studies 



G. R. FROST, WILLIAJM KEISTER AND ALISTAIR E. RITCHIE 292 



J 



Working Curves for Delayed Exponential Calls Served in Random 

 Order 



ROGER I. WILKINSON 360 



Magnetic Resonance : Part II — Magnetic Resonance of Electrons 



KARL K. DARROW 384 



A Study of Non-Blocking Switching Networks charles clos 406 



The Evaluation of Wood Preservatives — Part II 



REGINALD H. COLLEY 425 



Abstracts of Bell System Papers Not PubHshed in this Journal 506 



Contributors to this Issue 519 



COPYRIGHT 1953 AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



