|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
otlichnik
Procurator Caesaris
Caesar
   
Offline
Posts: 1218

|
 |
« Reply #10 on: February 17, 2012, 05:38:35 am » |
|
Excellent. Thanks Andrew. Well worth the 18 minutes to watch (and I think 9 for the second video). Has anyone been to the Melle centre?? Looks well worth a trip. They don't say for certain what weight of AE coin they are striking - as the Ptolemaic double eagle was found in several weight standards - but we are led to believe that it is the 8 gram denomination they talk about earlier. It is successfully struck cold using a 5kg sledge. I would love for them to experiment someday striking the earlier heavier Ptolemaic bronzes (up to 100 grams!) one day using the mouton / pile driver device described in "B. Bouyon, G. Depeyrot - J.L. Desnier, Systèmes et technologie des monnaies de bronze, (4e s. avant J.-C. - 3e s. après J.-C.), Wetteren, 2000." The cleaning set-up from the Alexandrian workshop is interesting. I will try to duplicate it some time with my small digital microscope and lap top. However, I think the digital microscope that I have (worth about $100) has such a narrow depth of field as to render this impossible. I am not sure though what she was doing using the rotary tool with what looked like a felt burnishing wheel. I have used this to gently polish ren wax on coins but I don't know how it could possible clean a coin. It is too soft. Interestingly the coin she was working on appeared to have had the patina burnished off in parts as it was showing rather coppery highlights. I wonder if she had put some form of abrasive paste on the coin first - then a felt wheel might do some cleaning though it would likely grind away the patina too. Shawn
|
|
|
|
|
Logged
|
SC (Shawn Caza, Vienna)
|
|
|
|
|
Lloyd
Procurator Caesaris
Caesar
   
Offline
Posts: 2240

I have my ship and Music is her name.
|
 |
« Reply #12 on: February 17, 2012, 04:51:38 pm » |
|
Andrew - thanks for posting the link. An interesting study, well documented in the video clip. I am interested to see that they are cold striking these bronzes, when there is ample evidence from other experimental archaeology coin striking efforts, and I understand written accounts, that the flans needed to be and were in fact heated to red heat at the time of striking so as to fully and clearly impart the design to the struck metal surface. This minimized the the blow to the die required to impart the design and thus resulted not only in improved quality of product but longer average die life. As a result, I'd view the die life quoted in the video with a degree of circumspection if it is asserted to be representative of ancient average die life achieved in a hot striking technique (as appears was the case). Notice also that in most video clips (on YouTube) of fakers using hand striking techniques they heat the planchet for an extended period in a furnace and then with a blow torch prior to the application and striking of the reverse die - for good reason and with ancient precedent!
|
|
|
|
|
Logged
|
|
|
|
|
|
|
|
Pekka K
Procurator Monetae
Caesar
    
Online
Posts: 2408

...one coin at a time...
|
 |
« Reply #15 on: February 20, 2012, 05:13:40 am » |
|
|
|
|
|
|
Logged
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|