ERRORS IX USE OF EQUATION FOR A^ 



11 



Table 1.5. Values of the constants a, b, and c in the expression AN = aAT + bAe 

 + cAP, for the ICAO Standard Atmosphere and 60 percent relative humidity 



Table 1.6. Comparison of errors in determining ^ from meteorological measurements 



assuming no error in the equation for N 



[p = 1013 mbar and RH = 60 percent] 



Table 1.7. Percentage contribution of errors in surface meteorological measurements 

 and constants in the equation for N 



This opinion is particularly reinforced by Essen's subsequent determina- 

 tion of K2 and A'3 at 9200 Mc/s, where closer agreement was obtained 

 with the Smith-Weintraub values (note items 9, 10, 11 in table 1.3). The 

 difference in K2 and /C3 accounts for most of the final difference in A'^ ob- 

 tained from the two formulas. Although the great precision of Essen and 

 Froome's work is reflected in their standard deviation of experimental 



