Chap. 7] 



GRAVITATIONAL METHODS 



237 



9876 S432 1 S 1 ? 3 f S 6 7 a 9 70 



Fig. 7-85. Scale distortion for gradients in Below-Jung's planimeter terrain correc- 

 tion (after Jung). 



and for the curvatures 



cos 2a dp , _ 1 



(sin 2a) p " 36 



-kfh 



RdRd^ = ~S. 

 36 



For small elevations at greater distances, when the square of the height 

 of the instrument above the ground is negligible compared with the square 

 of the distance, formulas 7-82, containing the integrals 



cos 

 (sin a) 



a , (dp 



