Fig. 554.
The common square butt-joint (Fig. 554) is the simplest way to join two pieces at right angles, as in making a box or frame, and is used for all common work. Glue is of but little use with this joint. Rely wholly on nails or screws.
Fig. 555.
To make a better joint, cut a rabbet at the end of one piece and you have a joint (Fig. 555) which shows less end wood, and can be helped a good deal by gluing, on account of the shoulder.
Fig. 556.
Another way is shown in Fig. 556. Some strength and stiffness is gained by the tongue and groove, but a groove near the end introduces an element of weakness.
