. Deep borehole surveys and problems. Boring. COMPASS AND PLUMB-BOB METHODS 129 tube A, while in the lower end is screwed a similar plug C washered at E. The wiring connection is similar in construction to that previously described above. These wires d, d' are carried in two opposite longitudinal grooves a^, a^ removing them from the circumference of the tube A from which they are insulated (Fig. 75). One wire a^ is connected with the terminal G and the other, a^, with the. Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for
. Deep borehole surveys and problems. Boring. COMPASS AND PLUMB-BOB METHODS 129 tube A, while in the lower end is screwed a similar plug C washered at E. The wiring connection is similar in construction to that previously described above. These wires d, d' are carried in two opposite longitudinal grooves a^, a^ removing them from the circumference of the tube A from which they are insulated (Fig. 75). One wire a^ is connected with the terminal G and the other, a^, with the. Fig. 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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