Metallurigical Tests Público Deposited
- From jlorenzo@ob.ilww.com Wed May 15 06:34:01 2002
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Date: Wed, 15 May 2002 13:33:56 -0000
To: colonial-coins@yahoogroups.com
Subject: Metallurigical Tests
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From: "njcopperjohn" <jlorenzo@ob.ilww.com>
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I am glad the test results came back the way they did and as expected
for the first cast. I did immediately zero in on that 2% lead figure
on the cast which seems to be the average percentage of lead based on
previous Smith readings from a previous CNL. Indeed, the cast coins
generally always give that one - two second blunt test ring when
tapped. The copper/lead percentages of G.T. 90% for copper and
ususally 2% or so for lead has this DIAGNOSTIC short ring sound for
casts.
I do not agree that the source can not be isolated. I have seen
reports in the Jounal of Historical Metallurgy in which geological &
historical records together with these results in large data bases
and reviewing the trace elemnets MAY pinpoint the quantitative
results of the alloy composition to a particular geological and
geographical region. We have never in this country incorporated an
expert geologist in these studies or have studied the pathways on
where the copper has come from to produce some of these coins. You
would be suprised how well the British Museum Team can pinpont the
geological source of some of these ancient coin hoards when using
muti-science sources these. We are still in elementary school in this
field as we have never needed these tools before until now to use
scientific instrumentation with geology and history to solve these
attribution problems. In the past we have used only one standard a
numismatist with great to nothing experience in HISTORY such as all
our curators in our museums and in the ANA,ANS,Smithsonian, etc. Are
any of these people chemists, physicists, geologists, or people of
science applicable to the field of metallurigal determinations in any
capacity other than Dr. Smith of Maine. Keep your minds open as this
is the KEY.
Enough said. John Lorenzo. - 2002-05-15
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