Definitions

from the GNU version of the Collaborative International Dictionary of English

  • A screw link, to which is attached the rope of a rope-drilling apparatus, for feeding and slightly turning the drill jar at each stroke.
  • A set screw used for adjusting.
  • n. in deep well boring, an adjusting screw connecting the working beam with the rope carrying the tools, for lowering the tools as the drilling progresses.

Etymologies

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