Preface 



The authors express their gratitude and appreciation to the many 

 members of the Central Radio Propagation Laboratory staff and others 

 with whom they have had the pleasure of working. This volume would 

 not have been possible without their assistance, encouragement, and 

 stimulation. Particular acknowledgements are due : R. L. Abbott, Mrs. 

 L. Bradley, Miss B. A. Gaboon, C. B. Emmanuel, L. Fehlhaber,* V. R. 

 Frank, Miss S. Gerkin, Mrs. B. J. Gibson, J. Grosskopf,* J. W. Herbstreit, 

 J. D. Horn, J. A. Lane,t J. R. Lebsack, R. E. McGavin, Miss F. M. 

 Meaney, C. M. Miller, K. A. Norton, A. M. Ozanich, Jr., the late Mrs. 

 G .E. Richmond, L. P. Riggs, P. L. Rice, C. A. Samson, W. B. Sweezy, 

 G. D. Thayer, Mrs. B. J. Weddle, E. R. Westwater, Mrs. P. C. Whittaker 

 and W. A. Williams. 



B. R. Bean 

 E. J. Button 



*Fernmeldetechnisches, Darmstadt, Germany. 

 tRadio Research Station, Slough, England. 



