The highest speed the lathe possesses is employed for polishing. This process is performed by the application of emery in either of two forms, viz., as emery cloth or in a granulated condition. Both may be procured in a variety of sizes or numbers, the selection of which will depend on the quality of surface produced by the tools, and the kind of finish ultimately desired. Sometimes fine filing is introduced as an intermediate process between turning and polishing, but is not advisable. Oil has to be used along with the emery to make it cut clean and regularly. As pressure is necessary in the process, the emery is usually applied between two pieces of wood, or legs, hinged at one end by a strip of leather, and long enough to give the desired lever power. If the surface is not well finished at the outset, several sizes of emery would be employed, the finest being used last. By a little attention the sharp corners will be allowed to retain their acute form, which is always advisable, for the sake of appearance, unless specially desired otherwise. The necessary quality of surface having been obtained, it is then cleaned and a light coat of oil applied to prevent rusting. On no account should emery be allowed to get near any of the lathe bearings, as the effect will be very detrimental, leading to endless trouble. Should a flat surface be desired, the movement of the tool would have to be at right angles to the axis of the lathe; in other respects the details would be practically the same as in plain turning.