. Deep borehole surveys and problems. Boring. PHOTOGRAPHIC METHODS 201 employed in California. It is about 2>yi in. in diameter and about 7 ft. long (Fig. 140) and is capable of taking 88 records each trip, the distance between each setting being at the control of the operator. The survey can thus be made in a normal round trip and usually at the rate of 1,000 ft. in 70 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 work
. Deep borehole surveys and problems. Boring. PHOTOGRAPHIC METHODS 201 employed in California. It is about 2>yi in. in diameter and about 7 ft. long (Fig. 140) and is capable of taking 88 records each trip, the distance between each setting being at the control of the operator. The survey can thus be made in a normal round trip and usually at the rate of 1,000 ft. in 70 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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