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Blackstrap
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
- A black, heavy oil sometimes used as a drill-rod dope or lubricant and as a mine-car-wheel lubricant. also called blackjack.
- Дешевый портвейн или ром, смешанный с патокой bla – blo
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Bottomed, английский
A completed borehole, or the point at which drilling operations in a borehole are discontinued.
Ball and socket reamer, английский
A borehole-reaming device consisting of a bit attached to a ball-and-socket or knuckle-joint member, which in turn is connected to the drill rods and used in borehole-deviation drilling. also called arc cutter.
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