VOLUME XXV JANUARY, 1946 no. i 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



Early Fire-Control Radars for Naval Vessels 



—W. C. Tims and W. H. C. Higgins 1 

 The Gas-Discharge Transmit-Receive Switch 



—A. L. Samuel, J. W, Clark and W. W. Mumford 48 



A Wood Soil Contact Culture Technique for Laboratory- 

 Study of Wood-Destroying Fungi, Wood Decay and 

 Wood Preservation John Leutritz, Jr. 102 



X-Ray Studies of Siuiace Layers of Crystals 



— E. J. Armstrong 136 



Notes — 



Some Novel Expressions for the Propagation Constant of a 



Uniform Line J. L. Clarke 156 



Decibel Tables K. S. Johnson 158 



Abstracts of Technical Articles by Bell System Authors .... 159 

 Contributors to this Issue 165 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



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