. Deep borehole surveys and problems. Boring. FLUID METHODS OF SURVEYING BOREHOLES 115 in Fig. 62) closely fits the inside of the glass tube. At the top the tube narrows into a neck with a threaded ring joining the glass tube with the Fig. 62. The registration apparatus is enclosed in a steel tube fitting closely in the hole and the registrations are made as follows: The zenith angle 6 is obtained by noting the greatest {h^^J and the least {h^.^J heights of the precipitation on Threephnes, ^BC, ACD. and BCD are allaf right angl&io each other. Angle BAC - 0, Angle DAC = ©j A plane
. Deep borehole surveys and problems. Boring. FLUID METHODS OF SURVEYING BOREHOLES 115 in Fig. 62) closely fits the inside of the glass tube. At the top the tube narrows into a neck with a threaded ring joining the glass tube with the Fig. 62. The registration apparatus is enclosed in a steel tube fitting closely in the hole and the registrations are made as follows: The zenith angle 6 is obtained by noting the greatest {h^^J and the least {h^.^J heights of the precipitation on Threephnes, ^BC, ACD. and BCD are allaf right angl&io each other. Angle BAC - 0, Angle DAC = ©j A plane through A, B and D corresponds to the fluicf ^surface. The line A -£" corresponds to the great axis and ihe angle D Ct is the apsidal angle ff> Tan V> = -r T-— ^ "l&O-l-'O. 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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