Clearly pattern welded ribs are another fascinating aspect of the barrel maker's art
https://docs.google.com/document/d/1zEE1xuaNuR26Drg3E_IMUEpA_YThLMP0VSIx2xJM9bA/edit

http://www.picturetrail.com/sfx/album/view/21182597

This would be spectacular refinished in 'black & white'



It is my opinion that the rib material was rod material, ground at another angle