. Deep borehole surveys and problems. Boring. [[ 2 -'ygf"4M Fig. 2.—The gyrocompass. jPj(j, 1.— Fig. 3.—The dip Fig. 4.—Registra- Complete measurer. tion section, instrument. Plate XIII.—The Kiel Nautical Instrument Co.'s gyroscopic compass borehole 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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