374 REFRACTION AND REFRACTIVE INDEX MODELS 



[15] Freehafer, J. E. (1951), Tropospheric refraction, Book, Propagation of Short 



Radio Waves, ed. D. E. Kerr, pp. 9-22 (McGraw-Hill Book Co., Inc., New 



York, N.Y.). 

 [16] Bean, B. R. (July-Aug. 1959), Climatology of ground-based radio ducts, J. Res. 



NBS 63D (Radio Prop.), No. 1, 29. 

 [17] Bean, B. R., and B. A. Cahoon (Nov. 1957), The use of surface weather observa- 

 tions to predict the total atmospheric bending of radio waves at small elevation 



angles, Proc. IRE 45, No. 11, 1545-1546. 

 [18] Bean, B. R., B. A. Cahoon, and G. D. Thayer (1960), Tables for the statistical 



prediction of radio ray bending and elevation angle errors using surface values 



of the refractive index, NBS Tech. Note 44. 

 [19] Bean, B. R., and G. D. Thayer (May-June 1963), Comparison of observed 



atmospheric radio refraction effects with values predicted through the use of 



surface weather observations, J. Res. NBS 67D (Radio Prop.), No. 3, 273. 

 [20] Anway, A. C. (1961), Empirical determination of total atmospheric refraction at 



centimeter wavelengths by radiometric means, Collins Res. Rept. CRR-2425 



(Collins Radio Company, Cedar Rapids, Iowa). 

 [21] Anderson, W. L., N. J. Beyers, and R. J. Rainey (Aug. 1960), Comparison of 



experimental and compeutd refraction, IRE Trans. Ant. Prop. AP-8, 456. 

 [22] Wilkerson, R. E. (July-Aug. 1962), Divergence of radio rays by the troposphere, 



J. Res. NBS 66D (Radio Prop.), No. 4, 479. 

 [23] Norton, K. A., J. W. Herbstreit, H. B. Janes, K. O. Hornberg, C. F. Peterson, 



A. F. Barghausen, W. E. Johnson, P. I. Wells, M. C. Thompson, Jr., M. J. 



Vetter, and A. W. Kirkpatrick (1961), An experimental study of phase varia- 

 tions in line-of-sight microwave transmissions, NBS Mono. 33. 

 [24] Thompson, M. C, Jr. (1962), Private communication. 

 [25] Bennett, C. A., and N. L. Franklin (1954), Book, Statistical Analysis in Chemistry 



and the Chemical Industry (John Wiley & Sons, Inc., New York, N.Y.). 

 [26] Brooks, C. E. P., and N. Carruthers (1953), Handbook of Statistical Methods in 



Meteorology (Her Majesty's Stationery Office, London). 

 [27] Schelleng, J. C, C. R. Burrows, and E. B. Ferrell (Mar. 1933), Ultra-short-wave 



propagation, Proc. IRE 21, No. 3, 427-463. 

 [28] Bauer, J. R., W. C. Mason, and F. A. Wilson (1958), Radio Refraction in a Cool 



Exponential Atmosphere, Tech. Rept. 186, Lincoln Laboratory, Massachusetts 



Institute of Technology, Cambridge, Mass. 

 [29] Beckmann, P. (1958), Height errors in radar measurements due to propagation 



causes, Acta Technika, 3, No. 6, 471-488 



