268, is one which has a spline or tongue inserted at right angles to the joint.

Since it furnishes more gluing surface, it is stronger than a plain miter.
_No.55.A slip-feather or slip-key miter_, Fig.

268, is one which is strengthened by a slip of hardwood glued into a saw kerf cut across the mitered angle.

It is used in picture-frames and in boxes.
_No.56.A slip-dovetail miter_, Fig.

268, is one in which a trapezoidal shaped key is inserted in a dovetail socket cut straight across the miter.