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Gebhardt survey instrument

A borehole surveying instrument often used to test the verticality of the freezing holes in shaft sinking. A vernier scale is used to determine the positions of the pendulum points at successive points, and by summating the results an accurate plan of the course of the borehole can be prepared.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 points
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