. Deep borehole surveys and problems. Boring. 52 DEEP BOREHOLE SURVEYS AND PROBLEMS This last item of check is probably the most important aspect of accuracy. If possible the method being adopted should be checked later by methods dependent on a totally different operating principle. Then the results Derrick Floor. Plan View of oinOil Well ComparingResulis of Several Surve\/s Derrick^-^ Floor I. 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
. Deep borehole surveys and problems. Boring. 52 DEEP BOREHOLE SURVEYS AND PROBLEMS This last item of check is probably the most important aspect of accuracy. If possible the method being adopted should be checked later by methods dependent on a totally different operating principle. Then the results Derrick Floor. Plan View of oinOil Well ComparingResulis of Several Surve\/s Derrick^-^ Floor I. 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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