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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. [1] While a rock drill may be as simple as a specialized form of chisel, it may also take ...
Simon Ingersoll (March 3, 1818 – July 24, 1894) was an American inventor who created the steam-powered percussion rock drill, which replaced the hand drill and was a major advancement in the mining and construction industries. [1] [2] The drill vastly increased efficiency. However, despite lower labor costs, there was no recorded upturn in ...
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.
In contrast to an Oldowan tool, which is the result of a fortuitous and probably unplanned operation to obtain one sharp edge on a stone, an Acheulean tool is a planned result of a manufacturing process. The manufacturer begins with a blank, either a larger stone or a slab knocked off a larger rock.
On November 20, 1908, he filed the basic patents for the Sharp-Hughes Rock Bit, and on August 10, 1909, was granted U.S. patent 930,758 and U.S. patent 930,759 for this rock drill. Hughes's two-cone rotary drill bit , nicknamed "rock eater", penetrated medium and hard rock with ten times the speed of any former bit, and its development ...
DTH drill tool operated with drilling mud (Drillstar MUDHammer) 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 ...