HE BELL SYSTEM. 



Jechnical journal 



VOTED TO THE SC I E N T I F IG^^^ AND ENGINEERING 

 PEGTS OF ELECTRICAL COMMUNICATION 



'LUME XXXI JANUARY 1952 NUMBER 1 



The Ferromagnetic Faraday Effect at Microwave Frequencies and 



its Applications — The Microwave Gyrator c. l. hogan 1 



DiaHng Habits of Telephone Customers 



CHARLES CLOS AND ROGER I. WILKINSON 32 



Selective Fading of Microwaves 



A. B. CRAWFORD AND W. C. JAKES, JR. 68 



Propagation Studies at Microwave Frequencies by Means of Very 

 Short Pulses o. e. de lange 91 



Properties of Ionic Bombarded Silicon russell s. ohl 104 



Mechanical Properties of Polymers at Ultrasonic Frequencies 



warren p. mason AND H. J. MCSKIMIN 122 



Relay Armature Rebound Analysis eric eden sumner 172 



Abstracts of Bell System Technical Papers Not PubUshed in This 



Journal 201 



Contributors to This Issue 213 



COPYRIGHT 1952 AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



