Cottingley Bridge
Tan Vats at Old Tan House

The leather industry needed sources of hides, water and tannin. Tannin, which was used to cure the hides, was from oak tree bark. Hides were steeped in tannin solution in tan vats or ouse pits as they were sometimes called.
Leather manufacturing was the second largest industry in Britain in the early 19th century.
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