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Date: | Thu, 1 Mar 2001 13:20:25 -0500 |
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Ralph Walter wrote:
>
> Would somebody please explain to me how you know when the tree was cut
> without having the outermost layer of wood (and therefore the bark) still in
> place? I understand how you can determine the sequence of years before it
> was cut, but without the bark, how do you know you're not looking at some
> sequence long before it was cut? Huh?
>
> Ralph
>
> Ralph
You are correct in recognizing that a wane edge (outermost growth ring) of the
timber being dendrochronoligized must be present. The dendro work done here in
North Carolina - largely in the eastern part of the state- was performed by Jack
Heikkenen of Blacksburg VA. He developed a statistical methodology - which he
patented - for comparing the width of one growth ring with the width of the
subsequent ring. As I recall he required a minimum of eight samples per
structure . Joists, rafters and other timbers with a wane edge were needed to
be statistically accurate. He would then identify a series of key years and
compare these to a known dated sample to determine when the tree was felled.
He was charging a couple of thousand plus expenses for this service.
Like Mr. Becker, I too must disclaim my correspondence. Must be some kind of
localized Tarheel bureaucratic deal.
--
F. Mitchener Wilds, Senior Restoration Specialist
Restoration Branch
State Historic Preservation Office
919/733-6547
http://www.hpo.dcr.state.nc.us
***My opinions may not be those of my agency.***
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