Fig. 105.
Fig. 106.
The feather edge which is formed on the inside is removed by a few strokes of a stone called a slip. Hold the slip firmly against the face so as not to form a bevel. [Fig. 106]. Slips are of various sizes; one that fits the curvature of the gouge should be selected.
56. Sharpening Plane-Irons.
—Plane-irons are sharpened straight across like the chisel, with the exception of the jack plane, as previously noted. Their corners, however, are very slightly rounded off to prevent their leaving marks on the wood. Where one plane is made to serve the purpose of smooth, jack and fore-plane, it should be ground straight across. In whetting, increase the pressure on the edges alternately so as to turn up a heavier feather edge there than in the middle, thus rounding the whole end very slightly. This feather edge may be removed in the usual manner.
57. To Tell Whether a Tool is Sharp or Not.
—Examine the cutting edge, holding the tool toward the light. If the tool is dull, the cutting edge will appear as a white line, the broader the line the blunter the edge. [Fig. 107] A. If the tool is sharp, no white line can be seen. [Fig. 107] B.
Fig. 107.