. Deep borehole surveys and problems. Boring. 74 DEEP BOREHOLE SURVEYS AND PROBLEMS of Nordhausen. It is essentially a double-gimbaled pendu- lum apparatus. It is screwed to the upper part of the core box and carries indicating needles which are fixed in posi-. 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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