. Deep borehole surveys and problems. Boring. DEVIATION AND ITS CAUSES 7 great importance. It is here that we find the greatest advancement in the technique of borehole-survey apparatus. This is significant not only because the proximity of other boreholes greatly increases the possibility of deflection but ignorance of the actual courses of the holes here would give rise to great trouble and expense later on; and perhaps. Fig. 2.—Course of a full suite of boreholes for a freezing shaft (depths in meters). disaster when encountering the unsolidified gaps between widely isolated frost walls or
. Deep borehole surveys and problems. Boring. DEVIATION AND ITS CAUSES 7 great importance. It is here that we find the greatest advancement in the technique of borehole-survey apparatus. This is significant not only because the proximity of other boreholes greatly increases the possibility of deflection but ignorance of the actual courses of the holes here would give rise to great trouble and expense later on; and perhaps. Fig. 2.—Course of a full suite of boreholes for a freezing shaft (depths in meters). disaster when encountering the unsolidified gaps between widely isolated frost walls or cementation zones. These possibilities will be apparent from a perusal of Fig. 2, which is an actual survey of the course of such holes previous to sinking operations. As the shallower seams and veins are won in the world's mineral fields it is manifest that deep prospecting holes to. 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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