. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . rig. 59—A lap board which is very convenient for polishing and grinding flat surfaces recommend the use of a combination stone which is com-posed of two stones (coarse and fine) cemented a stone is both convenient and economical, as it canbe purchased at the price of a single plain stone andthereby saves the expense of an extra one. The tool isfirst edged on the coarse side and the fine side is thenused to further remove the imperfecti
. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . rig. 59—A lap board which is very convenient for polishing and grinding flat surfaces recommend the use of a combination stone which is com-posed of two stones (coarse and fine) cemented a stone is both convenient and economical, as it canbe purchased at the price of a single plain stone andthereby saves the expense of an extra one. The tool isfirst edged on the coarse side and the fine side is thenused to further remove the imperfections of the previousoperation. Water or oil may be used to lubricate thestone. Some mechanics prefer one and some the is optional which is used. If it is desired to producean especially keen and delicate edge, the surface of thestone should be tiempered with wax or vaseline. These Tlie Use of Abrasives 95 substances fill the pores and interstices of the surfaceand regulate the sharpening process. A small hand stone should also be in every mechanicstool kit. This will be found very useful in sharpeningsmall drills, reamer edges, co
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