In grinding and fixing the iron of this plane, it is neces sary that the cutting-edge of the iron should stand equally prominent in all parts out of the face, otherwise the plane cannot make shavings of an equal thickness ; and, conse quently, instead of keeping the vertical position, as it proceeds, become deeper on the side on which the shavings are thickest, and then the part cut away will not be regular, for the bottom of the rebate will not be parallel to the upper surface of the wood, and the side which ought to have been vertical, will be a kind of a ragged curved surthce, formed by as many gradations or steps in the depth, as the number of shavings.
The sash fillister differs, in several particulars, from the moving fillister : the breadth of the iron is something more than the whole breadth of the sole, so that the extremities of the cutting-edge are, in a small degree, without the vertical sides of the stock : the fence is adapted to be moved to a considerable distance, not being fixed as in the moving fil lister, by screws upon the thee, but sustained by two bars fixed fast to it, which pass through the two vertical sides of the stock, at right-angles to the sides, fitting tight in the two holes through which they pass: these bars are made round ing upon the upper side, and flat on the lower side : at the point, where they are united to the fence, they have thicker parts, or shoulders, projecting downwards, because it is necessary to have the fence fixed on a lower level than the face of the plane ; the ends of the bars are ferruled, to pre vent their splitting when the ends are struck with the mallet, in order to move them in the holes through the stock, and this brings the fence either nearer, or more remote from the stock, as may be wanted ; and to fix it fast, when so adjusted, two small tapering pieces of wood, called kegs, are inserted into two small wedge-like mortises, cut at the sides of the mortises, in Si Ilia the bars pass through the stem; these wedges being drawn in, they will stick fast, and press against the bars, keeping them fast at all points, and thereby regu late the distance of the fence from the vertical side of the stock. This plane is generally employed to rebate narrow
pieces of wood, such as sash fimnes; and the fence is applied against the opposite edge of the wood to that on which the rebate is to be formed.
The plough is a plane with a very narrow face, made of iron, fixed beneath a wooden stock, and projecting down from the wood of the stuck, the edge of the iron being the full width, or rather more, thaw the thee ; it is guided by a fence with bars, like the faster above described, to make, or plough out a groove of the width of the iron, and at any required distance from the edge of the wood ; it has also a similar stop to regulate the depth it cuts to. Joiners, cabinet-makers, &c., in planting thin, or valuable woods for veneering, &c., sometimes use fluted irons, having teeth in their edge ; and a plane, thus mounted, is called a toothing plane ; these irons apply to the stocks of different planes. See TOOLS.