his 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. It is used for strong tee joints.

_No. 19. A beveled halving_, Fig. 265, is made like a middle-lap joint
except that the inner end of the upper member is thinner so that the
adjoining cheeks are beveled. It is very strong when loaded above. It
was formerly used in house framing.

MODIFIED HALVING JOINTS

_No. 20. A notched joint_, Fig. 265, is made by cutting out a portion
of one timber. It is used where it is desired to reduce the height
occupied by the upper timber. Joists are notched on to wall plates.

_No. 21. A checked joint or double notch_, Fig. 265, is made by
cutting out notches from both the timbers so as to engage each other.
It is used where a single notch would weaken one member too much.

_No. 22. A cogged or corked or caulked joint_, Fig. 265, is made by
cutting out only parts of the notch on the lower piece, leaving a
"cog" uncut. From the upper piece a notch is cut only wide enough to
receive the cog. A cogged joint is stronger than a notched because
the upper beam is not weakened at its point of support. It is used in
heavy framing.

_No. 23. A forked tenon joint_, Fig. 265, is made by cutting a fork in
the end of one member, and notching the other member to fit into
the fork, so that neither piece can slip. It is used in knock-down
furniture and in connecting a muntin to a rail, where it is desired
that the muntin should run thru and also that the rail be continuous.

_No. 24. A rabbet or rebate or ledge joint_, Fig. 266, is made by
cutting out a portion of the side or end of a board or timber X to
receive the end or side of another, Y. It may then be nailed from
either the side or end or from both. The neatest way in small boxes is
from the end, or better still it may be only glued.

_No. 25. A dado or grooved joint_, Fig. 266, is made by cutting in one
member a groove into which the end or edge of the other member fits.
Properly speaking a groove runs with the grain, a dado across it, so
that the bottom of a drawer is inserted in a groove while the back of
the drawer is inserted in a dado. Where the whole of the end of one
member is let into the other, such a dado is also called a housed
dado. Treads of stairs are housed into string boards.

To lay out a dado joint: After careful