Comparison with BL ms Ashmole 399

[MarcoP]

Image A is clearly a drain hole from the tank, which connects to a pipe on the reverse folio - I wrote it up somewhere on the forum. The two sides are connected by the flow of water.
Of course, what the water represents is anyone's guess.

I agree that this is the correct interpretation and the intended meaning: context makes this clear. Apparently, the illustrator got the perspective wrong and represented the top rim of the hole instead of the bottom one (which would be correct for the hollow shape of a hole).

Does the image [A] show an urinal ( matula ) ? I cannot find such a representation anywhere else. I think the usual representation looks like You are not allowed to view links. Register or Login to view.

Yes, the BL description says "urinoscopy". The shape of the container doesn't seem strange to me. Of course, the fact that the physician has dropped the container is  peculiar! I guess the scene would be much clearer if we had access to the text it illustrates.