. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ment to thismachine, adding a pair of small cylinders for use where air pressure isavailable instead of hand labour. Greatly increased speed is thus obtainedwithout in any way affecting the handiness and portability of the drill. The Diamond Rock Drill.—The full-sized Diamond drill (Appleby&■ Beaumonts patent) is shown in fig. 139, and is capable of putting downholes of 16 in. diameter to depths of more than 2000 ft., bringingout solid cores up to 30 ft. long, weighing more tha
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ment to thismachine, adding a pair of small cylinders for use where air pressure isavailable instead of hand labour. Greatly increased speed is thus obtainedwithout in any way affecting the handiness and portability of the drill. The Diamond Rock Drill.—The full-sized Diamond drill (Appleby&■ Beaumonts patent) is shown in fig. 139, and is capable of putting downholes of 16 in. diameter to depths of more than 2000 ft., bringingout solid cores up to 30 ft. long, weighing more than 3 tons, giving aperfect section of the strata passed through, as well as an absolute sampleof their mineral contents. 204 MACHINERY FOR METALLIFEROUS MINES. The framework of the drill is Ijuilt of steel girders, and consists ofa strong tripod mounted on horizontal girders, provided with all theappliances required to rotate the drill, to counter-weight the rods, andgive a uniform pressure on the cutting-head, to manipulate the boringrods, and give the variable supply of water required for forcing to the. Fig. 139.—The Diamond Rock Drill. surface the small particles of rock, resembling sand, which have beencut away by the drill in its downward progress. The power is derived from a 10 horse-power portable engine,transmitted by means of belting and gearing. Over the machine aset of sheer legs are erected as high as possible, with a pulley exactlyover the bore hole. By means of a chain connected to the hoistinggear on the drill and i)assing over this pulley, the boring rods can belifted out in lengths of three or four at a time, thus saving much timein unscrewing and recoupling the rods. For very deep borings of large THE DIAMOND ROCK DRILL. 20$ diameter a substantial derrick must be erected, as the weight of rodsand cores may amount to lo tons or over. A lean-to shed protects theengine and drill from the inclemency of the weather. The boring rods are made of solid drawn ste
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