Tubes and barrels were in the white (raw steel) in storage and during construction and shaping. So patterns could not be seen. There was of course some method to organizing tubes and components, but we do not know what that is. And when in the white, composite steel can be hit quickly with acid to show the pattern. So I am sire that things may have been checked at times in the process. But who knows, non of us were there.
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B. Dudley
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