Archive image from page 268 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 PROBLEMS 257 Let i = the inclination of the drill hole XXi from the horizontal. di = the angle between the bedding and the axis of the hole which is obtained from an examination of the drill cores. d = the difference in strike of the bedding and the drill hole. 8 — the true dip of the strata. Fig. 172. Let

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