265, the joint must be adapted to the rabbet.

The rabbet should therefore be plowed before the joint is made.

The rabbet at the end of the piece X is cut not the entire width of the piece Y, but only the width of the lap,--c-f=a-e.

This joint is used occasionally in picture-frames.
_No.18.A dovetail halving or lap-dovetail_, Fig.

265, is a middle-lap joint with the pin made dovetail in shape, and is thus better able to resist tension.