VOLUME XXII OCTOBER, 1943 number 3 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



Effect of Feedback on Impedance. . . R. B. Blackman 269 



Design of Two-Terminal Balancing Networks 



—K. G. Van Wynen 278 



Use of X-Rays for Determining the Orientation of Quartz 

 Crystals 



— W. L. Bond and E. J. Armstrong 293 



Raw Quartz, Its Imperfections and Inspection (Chapter IV) 



—G. W. Willard 338 



The New Statistical Mechanics . . . Karl K. Darrow 362 



Review of S. A. Schelkunoff's Book 



Electromagnetic Waves P.Le Corbeiller 393 



Abstracts of Technical Articles by Bell System Authors . 397 

 Contributors to this Issue 402 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



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