I think it might be for R&D of new machinery. It might be for checking an
overhaul. It might be for tracing vibration that has been noticed.


On the answer page I added some photos of the box that it came in, where you
can see some slots for pieces that I'm missing.

Also I updated the answer to the log grabs, and added Tom's scan from the
old Fairbanks catalog.

Thanks to everyone for their input on both of these.

http://pzphotosan191-x42.blogspot.com/

Rob