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Originally Posted by katana
Interesting picture Ed, the 'rings' on the cannon ......re-inforcement, 'cooling' fins or perhaps duel purpose .....I wonder ???
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Ed, interesting image indeed.
David, the rings would appear to me as reinforcements primarily.
And I believe it's because the ancient Chinese cannons and European cannons must have shared the same construction methodology -- the barrel was made from several thick slats of metal, then bound together with rings.
In fact the word "barrel" [of a gun or cannon] is a very descriptive term, historically -- a gun barrel then was made in a very similar fashion vis-a-vis how a barrel [container] was made.