VOLUME XXIII APRIL, 1944 NUMBER 2 



' THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TOi^THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



Indicial Response of Telephone Receivers . E. E. Moit 135 



Theoretical Analysis of Modes of Vibration for Isotropic 

 Rectangular Plates Having All Surfaces Free 



—H. J. McSkimin 151 



Principles of Mounting Quartz Plates . . R. A. Sykes 178 



The Magnetically Focused Radial Beam Vacuum Tube 



—A. M. Skelleit 190 



Abstracts of Technical Articles by Bell System Authors 203 



Contributors to this Issue 206 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



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