Yesterday afternoon on Walney Island.
It would be housed in a building called a Gin Gang.Ruins of farmstead lost in the jungle of the forestry commission plantation in the south of Arran. This is the turntable mechanism for the horse to walk round and round turning the huge cast iron crown-wheel which will drive a small bevel gear driving the shaft that would run into the building probably working a winnowing machine. Even though I knew close enough to where it was, it took 3 attempts pushing through spruce branches, avoiding tripping on brambles or falling on frost covered rotten fallen trees or sliding into ditches and bogs to finally find it again surrounded by forest.
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You have to get there, one of my favourite places in Gods country.That's on my list Steve. Never been there though.