. Deep borehole surveys and problems. Boring. 180 DEEP BOREHOLE SURVEYS AND PROBLEMS after the other, simply by moving the instrument and switching on the Fig. 118.—Instrument in borehole. Fig. 119.—Arrangement for large bore- holes. Electricity is supplied by a cable j running from a switchboard at the surface and located at a convenient. 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 Henr
. Deep borehole surveys and problems. Boring. 180 DEEP BOREHOLE SURVEYS AND PROBLEMS after the other, simply by moving the instrument and switching on the Fig. 118.—Instrument in borehole. Fig. 119.—Arrangement for large bore- holes. Electricity is supplied by a cable j running from a switchboard at the surface and located at a convenient. 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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