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Eastman survey instrument
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
Various models of a par¬ticular make of mechanical and photographic bore¬hole-drift indicators; the single-shot models are small enough to be used in ex diamond-drill holes. see drift indicator.
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Mechanical, английский
Photographic, английский
Indicators, английский
Variables that reflect economic performance; e.g., interest and unemployment rates, retail sales.
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Drift indicator, английский
Various types of mechanical or photo¬graphic devices used to determine the compass bear¬ing and inclination of the course of a borehole. compare clinometer, maas compass.
Drag bit, английский
Various kinds of rigid steel bits provided with fixed (as contrasted to the movable or rolling cutting points of a roller bit) and sometimes replace¬able cutting points, which are rotated to drill bore¬holes in soft to medium-hard rock formations. see diamond-point bit, fishtail bit, mid bit.
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