20 ELEMENTARY WOODWORKING 



is necessary to follow this jack plane with a finer one 

 having a straight edge in order to smooth the surface. 

 The jack plane might be called a roughing plane. 



FIG. 24. Relative Sizes of Smooth and Jack Tlanes 

 The lower figure is a jack plane 



11. The Smooth Plane. The smoothing plane is shorter 

 than the jack plane, its object being to smooth the sur- 

 face without regard to straightening it, as it is supposed 

 that the straightening has previously been done. The 



