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Founded c 1827.
Charlestown Foundry made the enormous 35ft pitchback water wheel, which was in production at Wheal Martyn by 1884. It was used to pump clay slurry up to the surface from the bottom of the china clay pits. The power from the wheel had to travel large distances via the ingenious system of connecting rods made of iron called flat rods. They travelled uphill for over half a mile and through narrow tunnels on a system of pulleys.
At some point between 1870 and c 1900 it provided at least one, but probably several waterwheels to the Tregargus Valley China Clay Works of Wheal Arthur, near St. Stephens.