On Mon, 7 Mar 2011, Kazimierz Verkmastare wrote:
As for what your bridge is made of, finding and orienting wood for bridges is a
mystic
art indeed. I find close grained hard maple at my local woodcutter, and create
thin
planks (3/8" or so) of flat-sawn lumber from bigger pieces with my bandsaw and
hand
planes. Having the grain lines oriented parallel to one face of the board is
necessary,
because though sound vibration carries in the heartwood section (the lighter
wood between
the rings)
Just a small point of nomenclature here:
"Heartwood" refers to the dense wood at the center of the tree.
"Sapwood" refers to the outer layer of wood closest to the bark that has not yet become heartwood.
When wood is cut, we see the rings of the tree's growth. For each year of growth, we see an area
of lower density, from when the tree grows quickly during spring and summer. This is called the
"early wood". We also see an area of higher density from the slower growth during the
fall and winter. This is called the "late wood".
I believe that you are referring to the early wood and late wood variation
here, not heartwood and sapwood.
Alden
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