Archive image from page 272 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 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, workin

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Archive image from page 272 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 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, etc.

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