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diamond drill

a drill having a hollow, cylindrical bit set with diamonds, used for obtaining cores of rock samples.
Origin of diamond drill
First recorded in 1820-30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for diamond drill
Historical Examples
  • For boring by rotary action the diamond drill is most effective.

  • A diamond drill is a most useful adjunct to exploration of a mine or deposit.

    The A B C of Mining Charles A. Bramble
  • The diamond drill does better work in hard strata than it does in soft.

    The A B C of Mining Charles A. Bramble
  • "It is a diamond drill, and strikes a bonanza on the lower level," said Carlin.

    The Comstock Club Charles Carroll Goodwin
  • The dangerous reef in the estuary of the Tees is in course of removal by means of the diamond drill.

  • I'm going to try to drill a hole through that screen with a hollow, quasi-solid beam: like a diamond drill cutting out a core.

    Triplanetary Edward Elmer Smith
  • The diamond drill is not effective in soft strata such as clay, sand, and alluvial deposits.

    Getting Gold J. C. F. Johnson
  • For commercial work, a diamond drill is often used, but this is scarcely necessary for the occasional work of a laboratory.

  • Food was given Tosheski in his prison to-day by means of a two-inch gas-pipe, forced through a hole made by a diamond drill.

    News Writing M. Lyle Spencer
  • The diamond drill camp was closed down and all the men had left, but the guard was still herding the property.

    Silver and Gold

    Dane Coolidge

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