. Deep borehole surveys and problems. Boring. Fig. 174. The true length of the borehole AB and its direction are found from the core and the survey. t = AAi cos 5 = {AA2 — AoAi) cos 8 AB sin 13 — A2B cos 5 (45) = {AB sin ^ — A2B tan a) cos 8 = {AB sin i3 — A2B tan 5 cos d) cos 8 = AB{siia. jS cos 8 — cos /S sin 8 cos d) III. Boreholes to Particular Points These may be grouped into two suites: 1. Those set at a definite angle, the problem being to find where it will hit a known seam, lode, workings, Please note that these images are extracted from scanned page images that may hav

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. Deep borehole surveys and problems. Boring. Fig. 174. The true length of the borehole AB and its direction are found from the core and the survey. t = AAi cos 5 = {AA2 — AoAi) cos 8 AB sin 13 — A2B cos 5 (45) = {AB sin ^ — A2B tan a) cos 8 = {AB sin i3 — A2B tan 5 cos d) cos 8 = AB{siia. jS cos 8 — cos /S sin 8 cos d) III. Boreholes to Particular Points These may be grouped into two suites: 1. Those set at a definite angle, the problem being to find where it will hit a known seam, lode, workings, 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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