PHE BELL SYSTEM 



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E > O T E D TO THE SCIENTIFIC ^W>^ AND ENGINEERING 

 SPECTS OF ELECTRICAL COMMUNICATION 



OLUME XXXI MARCH 1952 NUMBER 2 



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Introduction to Formal Realizability Theory — I 



BROCKWAY MC MILLAN 217 



An Application of Boolean Algebra to Switching Circuit Design 



BOBEBT E. STAEHLER 280 



Interaction of Polymers and Mechanical Waves 



W. O. BAKER AND J. H. HEISS 306 



The Reliability of Telephone Traffic Load Measurements by Switch 



Counts W. S. HAYWARD, JR. 357 



Network Representation of Transcendental Impedance Functions 



M. K. ZINN 378 



Abstracts of Bell System Technical Papers Not Published in This 



Journal 405 



Contributors to This Issue 409 



COPYRIGHT 1952 AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



