Fascinating KACEY, thank you very much! It is amazing how much there is still to be discovered about these old engines. I think you are probably right about the Gaskammer, it makes good sense to me
I don't think TAZ visits the forum anymore, unfortunatley (at least, I don't think he posts here any more). You could email him, I guess - or send him a message via OTF.
Bletchley