VOLUME XXX JULY X95X no. 3 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



Reduction of Skin Effect Losses by the Use of Laminated 



Conductors A.M. Clogston 491 



Some Circuit Properties and Applications of n-p-n Tran- 

 sistors R. L. Wallace, Jr. and W. J. Pietenpol 530 



A Photographic Method for Displaying Sound Wave and 

 Microwave Space Patterns 



W. E. Kock and F. K. Harvey 564 



Some Basic Concepts of Translators and Identifiers Used 



in Telephone Switching Systems . . .H.H. Schneckloth 588 



Waves in Electron Streams and Circuits J. R. Pierce 626 



Interaxial Spacing and Dielectric Constant of Pairs in 



Multipaired Cables J-T. Maupin 652 



iV-Terminal Switching Circuits E. N. Gilbert 668 



Coaxial Impedance Standards R. A. Kempf 689 



Instantaneous Compandors CO. Mallinckrodt 706 



The Evolution of Inductive Loading for Bell System Tele- 

 phone Facilities (Continued) Thomas Shaw 721 



Abstracts of Bell System Technical Papers Not Published 

 in This Journal 765 



Contributors to This Issue 777 



^Oi Copyright, 1951 $1.50 



per copy American Telephone and Telegraph Company p^^ Year 



