. Deep borehole surveys and problems. Boring. CORE ORIENTATION 61 III). In Fig. 1 (Plate III) note that the cross-guided heavy rod a is connected to the straight bit chisel ai by means of a conical joint. The bit has a small recess X on one side. Over the heavy rod the gun-metal body K is fixed by a conical Oynhausen joint hh' (Fig. 2). The bored-out non- magnetic box K encloses a watertight ground-in stopper r"'oi 1. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illust
. Deep borehole surveys and problems. Boring. CORE ORIENTATION 61 III). In Fig. 1 (Plate III) note that the cross-guided heavy rod a is connected to the straight bit chisel ai by means of a conical joint. The bit has a small recess X on one side. Over the heavy rod the gun-metal body K is fixed by a conical Oynhausen joint hh' (Fig. 2). The bored-out non- magnetic box K encloses a watertight ground-in stopper r"'oi 1. 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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