226 



M. N. Berdichevskii 



AB 



On the nomogram values ww ^I'e plotted along the ordinate and the 



values for the angle along the abscissa. The required value for the factor 

 A should be determined by interpolating bet-\\^een the lines of identical 

 values of the factor A. 



Example — We mil calculate the coefficient for an azimuthal arrangement, 

 characterized by the following dimensions: AB = 1000 m, MN = 200 m, 

 R = 3000 m, - 75°. From formula (3) we find the value of the factor 



/C* 



30003 . 10-3 

 1000 • 200 



= 135. 



60 62 64 66 68 70 72 74 76 78 80 82 



86 88 90 



Fig. 3. Nomogram of factor A. 



Frcim the nomogram (see Fig. 3) we determine the value of the factor A 



AB 



for the coordinates -gb = 0.167, = 75°. Interpolating between the iso- 



lines 6.65 and 6.70, we obtain A = 6.68. 



Thus, the required value for the coefficient K is 



A^ = 135 • 6.68 = 902. 



