•25 



In the above table the quantities in the columns 2^,„ G,„ F„„ G„„ are 

 coraputed by équations (7) and (8). These équations apply as they stand to 

 the computation of F„ and G„. To corapute F„, and G„„ we must alter équa- 

 tions (7) and (S) by making the following substitutions: 



m for 11, 

 31 for 2, 

 14 for 43, 

 43 for 14, 

 55 for 2G. 



The necessary sinuosity corrections are of course taken from table 2. G\, 

 and (?',„ are computed by means of équations (10). Thus for example, for 

 « = 31, 



as set down in the table. Consequently, 



and by équation (10), 



F.. + G„ f^ 



Z = + 0.3G 



G',. = ~0.64 



Proceeding now to the further computation by means of équation (12) 

 we hâve, taking n = 31, m=2: 



