DEVIATION AND ITS CAUSES 3 



Table II. — Average Horizontal Displacement in Rand Boreholes 



Fig. 1. — Sketch showing curves of boreholes and amount of horizontal displace- 

 ment at various depths, (a) Vertical projection. (6) Horizontal projection. 

 (After Joseph Kitchen.) 



The displacement is thus in these cases proportional to 

 the square of the borehole length and it usually tends to 

 describe a right-handed or clockwise curve. In one case 

 the displacement was 2,573 ft. away in a borehole depth 

 of 4,419 ft., i.e., a vertical depth of 3,288 ft. Mr. Kitchen 



