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Ed, fascinating. I have wondered about this myself.
Without petroleum, how did they get any sort of heavy grease? Like for wagon wheel bearings - can you 'thicken' one of those oils to make grease, by additives or some sort of process? Just curious.
Without petroleum, how did they get any sort of heavy grease? Like for wagon wheel bearings - can you 'thicken' one of those oils to make grease, by additives or some sort of process? Just curious.
