Archive image from page 211 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 Fig. 13S.—Compass and clinometer. are not accessible. However, it is known to be another application of the orientated drill-stem method, the survey Fig. 139.—Clinometer and coutact drum. principle being that of the multiple-photograph method wherein one or more pendulums are photographed for each position. It has been widely and successfully

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