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abrasive powder abrasive wheels acid air-floated alumina aluminium amount angle automatic barrel base metal brass brush buffing burnishing cent chromic oxide considerable cost current density cutting cyclone degree of polish deposit designed diameter discs dressed dust electro-polishing electrolytic polishing Electroplating emery employed felt bobs finish flat surface ft/min glue grades grain grease grinding grit hard highly polished hood labour layer leather lime machine manufacture material matt surface mechanical polishing melting point metal removed metal surface necessary nickel normally obtained overhead pebbles phosphoric acid plating polished surface polishing compositions polishing mop polishing operation polishing shop polishing spindle polishing wheel possible produced pumice purposes rays of light result rotated saponification satisfactory scratches sheet silica silver similar smooth soft Specimen specular reflection stearic acid stearine steel stitched mop suitable Surface speed temperature thickness tion Tripoli composition type of mop usually vary velocity wire