VOLUME XXVI OCTOBER, 1947 no. 4 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



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The Radar Receiver I. W. Morrison, Jr. 693 



High-Vacuum Oxide-Cathode Pulse Modulator Tubes 



C.E.Fay 818 



Polyrod Antennas G.E. Mueller and W. A. Tyrrell 837 



Targets for Microwave Radar Navigation 



Sloan D. Robertson 852 



Tables of Phase Associated with a Semi-Infinite Unit 

 Slope of Attenuation D.E. Thomas 870 



Abstracts of Technical Articles by Bell System Authors . . . 900 



Contributors to this Issue 904 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



504 per copy $1.30 per Year 



