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in use until the second half of the 19th century; they were typically twenty-foot (6 m) long paddle wheels with twenty-four steps around a six-foot (1.82 m) cylinder. Several prisoners stood side-by-side on a wheel and had to work six or more hours a day, effectively climbing 5,000 to 14,000 vertical feet (1500 to 4000 m). While the purpose was mainly punitive, the most infamous mill at Brixton Prison was installed in 1821 and used to grind grain to supplement an existing windmill which Cubitt

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