Show SELF ROTATING HAMMER DRILL the mining review is in receipt of a circular describing the wood self rotating hammer drill manufactured by the wood drill works 30 36 dale ave patterson new jersey among the claims made for this machine is that it can be used advantageously for every purpose to which a hammer drill can be applied such as road construction shaft sinking quarrying breaking up boulders driving spikes chipping stay bolts etc advantages claimed it can be operated by steam or air automatic rotation of the drill steel automatic lubrication balanced valve that travels only three sixteenths of an inch each way from center giving long wear drill hole automatically cleaned by pressure on the upstroke up stroke of the piston by wood self rotating hammer drill pressing down the button on the top of the chest full pressure is applied to the bottom of the hole through the steel blowing out cuttings best of material for each particular purpose specifications length overall over all 20 inches stroke 2 inches diameter of cylinder 2 inches size of steel used 78 or 1 inch hex hollow size of air hole va inch size of steam hose ya inch weight 47 pounds depth of hole drilled by steam capacity 6 feet by air capacity 10 feet |