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type-M drift indicator

A single-shot borehole-surveying instrument that records the compass bearing and inclination of the course of a borehole through the action of a strong beam of light directed through the plumb bob onto a light-sensitive paper disk. It is similar to, but larger than, a type-D drift indicator.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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