Archive image from page 54 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 AUXILIARY REGISTRATIONS IN BOREHOLE SURVEYS 43 of the hole at the surface, are known with respect to the X and Y axes, and the depth of any point A on the wire can be found, since we can get the length L of the wire direct.

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