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Ed:

Have a few myself, fascinating devices, and in an ever increasingly complex world, the "stick" rules had only 2 moving parts. The bambo rules are self lubricating I understand. As for the metal ones, a bit of oil seems to do the trick.

Moving on, did you ever come across the circular type. They were made by Gilson as I recall. The 8" diameter rules, with the C scale being outboard, provide a C scale 24" long, which in theory would be more accurate than the standard 10" stick type. The circular slide rule never seemed to have taken off though. Curious, but then the stick type might have been to well established to buck. Take care.

Alan