A great deal of the finisher's work is now performed by large grindstones and buffs; all that in many instances remains to be done being to inspect the work, and correct any irregularities, going over the surfaces with the finest emery cloth. In many surfaces absolute flatness is not required so much as perfection of finish. In such instances the scraper would not be used at all, but files and emery of various degrees of fineness, until the surface was of the quality specified. In order that the partial flatness of the surface obtained by the files may not be lost, the emery cloth must be applied by a piece of flat wood. In many workshops emery is not allowed on flat surfaces intended to work on one another; the only finish they receive coming direct from the scraper. All finished surfaces, liable to rust, should be coated over with clean oil before being laid away; and even this may require to be supplemented by a covering of white lead and tallow if the work be intended for transport, or to remain unused for a long period of time.