. Deep borehole surveys and problems. Boring. COMPASS AND PLUMB-BOB METHODS c. LeaiherWasher Sweaied Jolnfs 143 ^ Fio. 8 Vertical Section on b-b Plate IX.—Briggs' clinophone 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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