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2. Drifter drill - Wikipedia

   en.wikipedia.org/wiki/Drifter_drill

   Drifter drill. Power rock drill, mounted on a column, in operation in a mine. A drifter drill, sometimes called a rock drill, is a tool used in mining and civil engineering to drill into rock. Rock drills are used for making holes for placing dynamite or other explosives in rock blasting, and holes for plug and feather quarrying.

3. Howard R. Hughes Sr. - Wikipedia

   en.wikipedia.org/wiki/Howard_R._Hughes_Sr.

   Howard Robard Hughes Sr. (September 9, 1869 – January 14, 1924) was an American businessman and inventor who founded the Hughes Tool Company. He invented the "Sharp–Hughes" two-cone rotary drill bit during the Texas Oil Boom. Hughes was the father and namesake of Howard Hughes (Howard Robard Hughes Jr.) the American business tycoon and ...

4. Core sample - Wikipedia

   en.wikipedia.org/wiki/Core_sample

   A core sample is a cylindrical section of (usually) a naturally-occurring substance. Most core samples are obtained by drilling with special drills into the substance, such as sediment or rock, with a hollow steel tube, called a core drill. The hole made for the core sample is called the "core hole". A variety of core samplers exist to sample ...

5. Tunnel boring machine - Wikipedia

   en.wikipedia.org/wiki/Tunnel_boring_machine

   Tunnel boring machine. A tunnel boring machine (TBM), also known as a "mole" or a "worm", is a machine used to excavate tunnels. Tunnels are excavated through hard rock, wet or dry soil, or sand, each of which requires specialized technology. Tunnel boring machines are an alternative to drilling and blasting (D&B) methods and "hand mining".

6. Rock Drill (Jacob Epstein) - Wikipedia

   en.wikipedia.org/wiki/Rock_Drill_(Jacob_Epstein)

   Study for Rock Drill (c. 1913) is a 67.5 cm (26.6 in) × 42.5 cm (16.7 in) charcoal drawing by Epstein which is part of The Garman Ryan Collection at The New Art Gallery Walsall. [7] Whilst the exact date of the sketch is unknown, because it is a preparatory study for Epstein's full sculpture Rock Drill , it has been dated to 1913.

7. Down-the-hole drill - Wikipedia

   en.wikipedia.org/wiki/Down-The-Hole_Drill

   Down-the-hole drill. A down-the-hole drill, usually called DTH by most professionals, is basically a jackhammer screwed on the bottom of a drill string. The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or drilling mud). The DTH hammer is one of the fastest ways to drill hard rock.