. Deep borehole surveys and problems. Boring. DEVIATION AND ITS CAUSES 3 Table II.—Average Horizontal Displacement in Rand Boreholes Nos. Nos. Nos. Nos. Nos. Depth, feet 1 to 8, 9 to 16, 1 to 16, 17 to 22, 1 to 22, feet feet feet feet feet 500 15 10 10 35 20 1,000 85 70 75 145 95 1,500 210 190 200 290 225 2,000 400 390 395 485 420 2,500 610 635 625 3,000 860 910 885 3,500 1,150 4,000 1,485. 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
. Deep borehole surveys and problems. Boring. DEVIATION AND ITS CAUSES 3 Table II.—Average Horizontal Displacement in Rand Boreholes Nos. Nos. Nos. Nos. Nos. Depth, feet 1 to 8, 9 to 16, 1 to 16, 17 to 22, 1 to 22, feet feet feet feet feet 500 15 10 10 35 20 1,000 85 70 75 145 95 1,500 210 190 200 290 225 2,000 400 390 395 485 420 2,500 610 635 625 3,000 860 910 885 3,500 1,150 4,000 1,485. 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., , a vertical depth of 3,288 ft. Mr. Kitchen. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Haddock, M. H. (Marshall Henry). New York, McGraw-Hill
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