. Deep borehole surveys and problems. Boring. Fig. 172. Let. Fig. 173. A = any point on the drill hole—in our figures it is the point at which the drill hole enters the bed or seam—from which a perpendicular can be erected on to the plane of the bedding. Call this perpendicular 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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