. Deep borehole surveys and problems. Boring. 56 DEEP BOREHOLE SURVEYS AND PROBLEMS the width of the hole, and diamond drilhng with its small holes later on made it obsolete. A similar method was also applied by the engineer Zobel in Schonebeck in 1855.^ Lubisch's Method.—The boring master Lubisch improv- ed on Kind's method in the Upper Silesian mineral fields in 1887. He diamond drilled a core first without a core catcher, leaving the stub standing in the hole. Then he lowered a second tube (Fig. 28) over the stub and marked it in a definite manner respecting the meridian and later extracted
. Deep borehole surveys and problems. Boring. 56 DEEP BOREHOLE SURVEYS AND PROBLEMS the width of the hole, and diamond drilhng with its small holes later on made it obsolete. A similar method was also applied by the engineer Zobel in Schonebeck in 1855.^ Lubisch's Method.—The boring master Lubisch improv- ed on Kind's method in the Upper Silesian mineral fields in 1887. He diamond drilled a core first without a core catcher, leaving the stub standing in the hole. Then he lowered a second tube (Fig. 28) over the stub and marked it in a definite manner respecting the meridian and later extracted it, orientating it as in Kind's method. It suited small holes better. In Fig. 29 the steel tooth of the orientating tube closes about the core and makes a definite. 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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