Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 308
Section XIV. MINING. Quarrying, Ventilation, Hoisting, Conveying, Pulverizing, Separating,Roasting, Excavating, and Dredging. … 1195. DIAMOND PROSPECTINGDRILL, operated by hand. The drill rod ishollow, with a hose connection at the top,through which water is forced to the bottomand up outside of the drill to wash out the bor-ings. The drill point is set with bort or blackdiamonds, and is revolved quickly by the cranksand…
Mechanical movements
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