Graphical Construction Glossary >> Woodwork. >> >> Lumber Timber
The feature of a tree is that it grows a certain amount each year and that it does this by adding an extra layer to the outside.
This exogenous growth provides the tree and the timber or lumber that we get out of it with those growth rings that that give us the grain.
The main cells in the tree trunk are aligned vertically but the medullary rays, that range from microscopic and indetectable by eye, to probably 12mm or 1/2" wide .
These rays are seen as a decorative feature of a few hardwoods and the one that seems to provide the largest of them all is English Oak.
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