JOBO drum numbering system...... long thought to be another clue in the DaVinvi Code. Tubes with specific numbers, once arranged in a specific sequence will produce an image of the first son of Jesus and Mary M. Just pop in an 8x10 unexposed sheet of AZO Grade 1 made in Jerusalem and out pops the image. A few have shown up on eBay, fetching milliions.
I once mis-arranged the drum numbers and British chap with a white towel popped out of the fixer drum. He trashed my house and I had a heck of a time getting him back into the JOBO processor so he would disappear again.
That's the only rationale for they way they number drums - to actually hide their real purpose. If you go see the movie, watch closely in the scene with the dead monk spread out on the cloor in a circle. The circle is actually the circumference of a specific JOBO drum and a code he scrawled on the floor contains a clue to the drum number. Your search will begin there, where it will end, well, I cannot say.
-R