For additional strength there is the wedgeshaped, beveled lap that can entirely a sawing project; the tabled joint and the dovetail half lap are a illustrated. To prevent splitting under the dovetail, the more complicated joint is chiseled out as shown in the steps at the bottom of the diagram. Dado. A familiar joint for supporting shelving or drawer bottoms, the dc (Figure 1.26 a), or housing, is but a deeper, narrower version of one member Fig. 1.26a. Dadoes. a. cross lap; it is, in fact, but a wide groove. When the groove is not extende fully to the face of the vertical member it is known as a "stopped housing"; the horizonal member is rabbeted, the joint is called a "shouldered housing. To counteract lateral strain the joint may be dovetailed, as shown in the figure •his too may be constructed as a stopped dovetail housing, ь Short dadoes across the edges of stock where one member crosses and is sur. 76 . ported by the other member are known as single or double notching, as the case may be. A modification of this joint, where the lower member is of much thicker material, is the cogged or shoulder notch. A more complicated version is sometimes used to join two heavy members in a wedge halving. A diagonal bracing, termed "toe notching," is sawed out to accommodate the joining of two members at an acute angle. The simple series of joints called notching is shown in Figure 1.26 b. Miter Joint. As described in the section on planing, plain miter joints can be quickly and accurately sawed in a miter box. Variations shown in the diagram (Figure 1.27) include mitered half lap (on lap miter), the secret tenon miter, and, for maximum strength, the dovetail tenon miter. A favorite method Fjg. i2 7. Miiers. CABINETMAKING Vpea jyfort'с e Tenon ~4 Ke.ye.at Tenon BJ'nd S Faced Siidle Joint ¦ Wedged Throug fz ?'hoa Hiunched Tenons ?eve ZapxJoint s__--- ?lmdWedged or Foxed Fro. i.28. Mortise and tenon joints. 28 . of strengthening the plain miter after it has been glued and while it is still clamped is to saw a groove across the outer angle of the joint into which a "slip feather" or thin piece of veneer can be glued or "splined'' in place. Another method of securing the miter is by means of a dovetail key from the underside. Mortise and Tenon. Although it is one of the oldest joints, the mortise and tenon (Figure 1.28) is also one of the strongest and, therefore, ubiquitous in furniture construction. Both house and cabinet doors use this joint, and table legs are almost invariably joined to their aprons with a mortise and tenon. The simplest form of this joint and the easiest to cut is the open tenon. Like all other tenons this may be pegged, screwed, or nailed for added security. The bridle joint is another version in which one member is joined near the middle with a form of open tenon. From a construction standpoint, the simplest form is the through mortise and tenon, where the holes for the mortise can be bored entirely through the member.