Diamond Powder
A cutting and polishing agent prepared from the crushed chips from the diamond cutter's table, black, brown, and other inferior stones, known as bort, and small diamonds. After pulverizing thoroughly, the powder is decanted in olive oil to various degrees of fineness. To be had of material dealers generally. Used for charging the face of mills or laps for grinding and polishing hard stones, etc. It is also used for drilling by being applied to the end of a small taper piece of steel, flattened on the end for the reception of the powder, which is moistened with olive oil.