Antonio Scapini,
Very interesting stuff and thank you for all you have done. Unfortunately I haven't your book yet. I am most certainly not an expert like yourself or as knowledgeable. IYO "the double way" was used. Maybe I should get your book first before I comment lol. Antonio I don't think it's impossible to resolve, anything is possible. As you probably already know this Double process was really something. Meaning two metals. The precious metal and alloys are separate. The sheets of double metal are placed on top of each other, heated in a type of furnace and welded together under hydraulic presses at very high pressure then rolled out to any desired thickness. Round discs are punched out of this double sheet metal and then seamless tubes are drawn from them. This process was manufactured in special factories and supplied in sheet and wire. The production of double wire is more difficult and the procedures are different.. . Both methods require rolling respectively and very well-trained personnel to say the least.
A very short version of the procedures and I hope you don't mind Antonio. Just to clarify, in your opinion you believe it's from these seamless tubes that the HR was made? Just tell me to be quite and get your book lol. All the best!
Thanks Mikee for your post. Indeed something I was waiting since years...
The Doublè happened exactly the way you wrote. I also reported this on my research.
But... rings are not really "doublè", I just mentioned the "doublè style" because there are 2 layers togheter, and to obtain it, usually both pressure and heat, are necessary (it is also possible to obtain a 2 layers band with heat only...).
I am sure TK rings has a layer inside for these reasons:
1) internal layer has a different composition with respect to the central band of the ring;
2) the X-rays that work on copies made in silver, don't work on TK rings (the inner layer with tin stops them and a much more higher exposure is needed to obtain something);
3) some parts of the inner layer sometimes lift-off and you see missing pieces of metal (and this is something absolutely impossible to happen on a one piece ring made by casting or pressing).
And I was not able to understand if the inner layer was added thru pressure or heat, or both.
IMO rings bands were all made that way and I am quite sure (for several reasons I didn't write on the book to avoid it becomes too boring) at the beginning there was only a long tube with inner layer then cut in rings.
Not sure you understand what I mean, so apologies if I was not clear, but it is hard to explain.
PS: is it possible Gahr used blank rings made by specialized factories as you mentioned... We really know nothing about.
