In the effort to keep the fence pressed close to the side of the wood, the tendency is to tilt the plane over.

This causes the very opposite effect from that desired, for the spur runs off diagonally, as in Fig.
114.
[Illustration: Fig.114.Result of Careless use of Rabbet-Plane.] If this happens stop planing at once, clean out the recess properly with a chisel and then proceed.
The _dado-plane_ is much like the rabbeting-plane, except that it is provided with two spurs, one at each side of the cutting edge, to score the wood before cutting.
The _molding-plane_, Fig.

113, as it name indicates, is for making moldings of various forms; as, quarter-round, half-round, ogee, etc.
[Illustration: Fig.115.

Tonguing-and-Grooving Plane.] The _tonguing-and-grooving-plane_, Fig.

115, is for matching boards, i.e.making a tongue in one to fit into a groove in another.