Wheal Chance
- 1776 Mine sett of Roskear Mine (or Wheal Chance), which became a large mine near Cambourne
- 1780 Boulton and Watt erected an engine there
- In Watt's time called Wheal Chance; then Prince William Henry; and in the present day Roskear Mine (1870s)
- "In 1818 I saw working at Wheal Chance Mine, near Scorrier, an old 60-inch cylinder Boulton and Watt engine". The old 60-inch cylinder Boulton and Watt engine, at Wheal Chance (one of Watt's favourite engines), was in 1818 transformed into a high-pressure engine,