This section is from the book "Elements Of Construction", by Charles A. King. Also available from Amazon: Elements of construction.
Table Leg Joint. Fig. 139.
Material:
1 piece, 4 1/2" X 2 1/2" X 2 1/2".
2 pieces, 6" X 3" X 7/8".
As its name implies, this joint is used to fasten the rails and legs of a table together. It is an application of the mortised and the relish joint, Topic 66, but it has a shoulder upon the face side only, as at a. This saves making two cuts upon each end of each rail, and gives a thicker and stronger tenon. The dowel joint is frequently used as a substitute.

Fig. 139. - Table Leg Joint.
The mortise gauge should be used in marking the leg for the mortise; a sinkage of from 5/16" to 1/2" should be allowed at b. In cutting the tenons on the ends of the rails, we have an illustration of a case in which it is best to work from the back side, instead of from the face, as the thickness of the tenon must be marked from that side. The joint is sometimes drawbored from the back side, which adds much to the strength of the table.
Smooth and sandpaper separately, and do not glue together.
 
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