NASA NTRS · 19800000066
Drilling side holes from a borehole
Abstract
Machine takes long horizontal stratum samples from confines of 21 cm bore hole. Stacked interlocking half cylindrical shells mate to form rigid thrust tube. Drive shaft and core storage device is flexible and retractable. Entire machine fits in 10 meter length of steel tube. Machine could drill drainage or ventilation holes in coal mines, or provide important information for geological, oil, and geothermal surveys.
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Collins, E. R., Jr.. 1980-08-01. Drilling side holes from a borehole. https://ntrs.nasa.gov/citations/19800000066
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