Archive image from page 272 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 PROBLEMS 261 true dip of the seam 5 is shown by the angle ADiAi and its dip a in the direction of the borehole by the angle A2BA1. WXYZ is the horizontal reference plane /3 = A2BA = dip of borehole, and by the funda- mental dip formula for an apparent dip a and true dip 8 tan a = tan 8 cos 6. t = the true thickness of the beds.

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