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Wheal Busy. Area: A6i Steve Hartgroves © Cornwall Council Mining for tin at Wheal Busy dates from the 17th century but the mine is particularly noteworthy for the variety of steam engines known to have been at work here: a Newcomen atmospheric engine was erected c.1725, followed in 1775 by a 72 inch improved atmospheric engine by John Smeaton, then the largest of its type in Cornwall; the first Watt separate-condenser engine in Cornwall was also commissioned for here in 1778.
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