Chap. 7] 



GRAVITATIONAL METHODS 



151 



i)2 + (x - by 



A, = 2M [. log, |/^i - (. - 6) log. ^, + (^ _ ,y 



+ « (tan- i - tan- ^-^^) - . (tan- 1 - tan- lZ_^)] , 



Fig. 7-44. Effects of two-dimensional bodies on gravity, (a) Cylinder, (6) rec- 

 tangle, (c) step fault, (d) triangular prism, (e) slope, (/) inclined bed, (g) anticline, 

 (h) syncline. In (d), (e) and (/), the distance x should extend to a point but half- 

 way up the slope. 



