Gary Coffman wrote:
On Sat, 26 Jun 2004 11:13:49 +1200, Eric Stevens wrote:

On Wed, 23 Jun 2004 23:46:01 -0500, Tom McDonald
wrote:

In the case of the copper artifacts in the upper Great Lakes
area, all of the shapes and structures have been shown to have
been made via cold and hot-working techniques.

This is not my understanding. Metallurgical examination has shown that
some of the artifacts have been cast.


The evidence brought out in this thread is that *one* copper artifact
shows radiographic evidence (characteristic porosity) for part of it
being heated above the melting point in atmosphere at some point.
That is in no way conclusive evidence of casting technology. The
piece may have been an attempt at casting, or it may simply have
been overheated while being worked.

Gary

Gary,

Are you referring to the sort of amorphous, three-cornered blob
listed in Conner's web site as 'R666', and in the Milwaukee
Public Museum (where it's curated) as '55786':

http://www.iwaynet.net/~wdc/copper.htm

If so, I have found additional information about that piece.

Tom McDonald