CARN-MARTH, a hill in the south-eastern vicinity of Redruth, in Cornwall. Its height is 757 feet. An excavation in the side of it, called Gwennap-pit, was the scene of Wesley's famous preaching to the miners; and is still used, by the Wesleyans, for an anniversary celebration, generally attended by upwards of 20,000 persons.

(John Marius Wilson, Imperial Gazetteer of England and Wales (1870-72))