A crown-like moulding suitable for installation at oblique joints.

A portion of a branch or limb that has become incorporated in a piece of lumber.  In lumber, knots are classified as to form, size, quality and occurrences.  A red knot is one that results from a live branch growth in the tree and is inter-grown with the surrounding wood.  A black knot is one that results from a dead branch which the wood growth of the tree had surrounded.

(a)  A pin knot is not over 1/2".
(b)  A small knot is not over 3/4".
(c)  A medium knot is not over 1-1/2".
(d)  A large knot is over 1-1/2".
(e)  A sound knot contains no decay.  It may be red or black.
(f)   A tight knot is so fixed by growth, shape or position that it retains its place in the piece.  It may be red or black.
(g)  A "loose" or "not firmly fixed" knot is one not held tightly in place by growth, shape or position.
(h)  A "fixed" knot will retain its place in dry lumber under ordinary conditions but can be moved under pressure though not easily pushed out.

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