It was used for converting hides into leather and was the last traditional tannery to work in Wales. It specialized in producing heavy leather for boots and horse harness. The waterwheel is mounted externally on the gable wall and drove the grinder via a shaft through a pair of bevel gears. Oak bark was the main ingredient used in the tanning process and was stored and ground into powder in the large barn adjacent. The raw hides were soaked in an increasingly strong bark solution in the pits before being scrubbed on the stone table. They were then dried and rolled flat. The whole process took eighteen months._
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