Joe,
I noticed that as well. Certainly a unique approach. I have never seen it done this way before nor have I seen any written references to such a technique.
I guessing they are trying to show what the rolling mill would have done. They seem to be simply stacking iron / steel. Although the proportions are very large... This is a demonstration barrel after all.
This would have been the normal billet construction before being rolled.
This shows the chemise. If you look closely you can see the split. The chemise would have stayed with the barrel through out the forming. The smiths were constantly removing and inserting the mandrel. I believe it kept the barrel from being welded to the mandrel. The chemise would have been removed during the initial boring.
What is missing is the collar and handle that would have extended to the right. Also the material would have been at a right angle to the mandrel during the forming, but you already know that Joe.
Pete
