Vane Material and Lubrication - Judson
Looking at Dave's last picture on the first post those vanes look like they are made of the original brown Tufnol. http://www.tufnol.co.uk/tufnol/default.asp
From this link
http://beetle.cabriolets.online.fr/tech/how09.htm
I read
"As the vanes need to be kept well lubricated, oil is fed to the inlet manifold of the Judson from a glass container filled with engine oil. This oil is drawn into the supercharger by inlet vacuum and, after lubricating the vanes, passes into the engine to be burnt along with the fuel. Judson claimed this helped engine longevity by acting as an upper cylinder lubricant."
Judson...yet another section name to add Mr. Adminstrator (Micheal).
James.