CONTENTS V 



Deterioration of Organic Polymers — B. S. Biggs 1078 



The Development of Electron Tubes for a New Coaxial Transmission 



System — G. T. Ford and E. J. Walsh 1103 



Telephone Traffic Time Average — John Riordan 1129 



The Reproduction of Magnetically Recorded Signals — R. L. 



Wallace, Jr 1145 



Some Results Concerning the Partial Differential Equations Describ- 

 ing the Flow of Holes and Electrons in Semi-conductors — R. C. 

 Prim, III 1174 



Instantaneous Compandors on Narrow Band Speech Channels — J. C. 



Lozier 1214 



The Evolution of Inductive Loading for Bell System Telephone Facili- 

 ties — Thomas Shaw 1221 



