 A great many of these pumps and engines were installed by Richard Michell (1748–1836) of Gwennap and his descendants.In November 1806 he and four others, namely Captain John Martin, Captain John Dennis, Captain W. Davey and Captain T. Trestrail, met at Busveal and agreed to repair Gwennap Pit, or rather reconstruct the amphitheatre in respect to and in memory of John Wesley.It opened and had preaching in it on 18 June 1807.