Another ancient "map"?

[Mark Knowles]

There are other pages where those pipes that we see in the Rosettes appear, in the zodiacal section and in Quire 13. For the sake of consistency, we must think that the drawings mean the same thing.

I don't think we need to say that very loosely similar drawings automatically must represent the same things throughout the manuscript.
A "pipe" or "cannon", as I think they are, on the Rosettes folio, is a essentially a cylinder which is one of the most simple mathematical shapes, so it could easily represent more than one thing.