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Old 12-06-2008, 10:07 PM
Joe Geranio Joe Geranio is offline
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Default Tiberian Die (Precious Metal Die of Tiberius) Joe Geranio

Tiberian Die (Precious Metal Die of Tiberius) Joe Geranio

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The rather startling photograph of a coin die of Tiberius caught my
attention immediately. This appears to be a specimen from the 1863
Paray-le-Monial find of seven Roman Imperial dies, and is now at the
Musee des Antiquites Nationales (at Saint-Germain-en-Laye).

This particular die is exceptionally well preserved. Other dies
from the same find show differing degrees of corrosion. There is
little doubt (none in my mind) of its authenticity.

There have been five obverse dies of this type discovered in France
(two in this find, and three in the Auxerre find of 1799). One, from
the latter find, was destroyed in testing in 1945.

Roman precious-metal dies of this period appear to have been made
of a very hard alloy (about 25% tin bronze -- a bell-metal alloy).

http://flickr.com/photos/paul_garlan...7600535939705/

Paul Garland photo
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Old 12-06-2008, 11:44 PM
rasiel rasiel is offline
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the link is unfortunately broken - any chance you can upload it to your account? i for one would be interested in seeing it.

i'd also be interested in learning by what reasoning the dies are supposed to be made of tin-rich alloys. at first blush, tin being a very soft metal, would not seem to be an ideal component for a hard alloy. from my understanding bronze is only slightly harder than raw copper. the primary advantage i believe is resistance to corrosion. my guess would be the hardest allow known to the roman era would be steel (iron with carbon added).

in my limited understanding of the subject cast iron is poured into a die mold. the plug is then polished and a negative image engraved. once the design is complete the die is then repeatedly fired at high temperatures and rapidly cooled by soaking in water. the cycles progressively harden the metal.

ras
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Old 12-14-2008, 06:37 PM
Joe Geranio Joe Geranio is offline
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Sorry,

Here you go:

http://ancients.info/forums/showthread.php?postid=12826
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Old 12-14-2008, 06:39 PM
Joe Geranio Joe Geranio is offline
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Default The Damnatio Portraiture and Coinage of Caligula- Joe Geranio

http://www.forumancientcoins.com/num...0Joe%20Geranio

Please add any Damnatio coinage you may have of Caligula.

Thanks,

Joe Geranio
Julio Claudian Iconographic Association
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