Engine House And Associated Buildings From The Middle Engine Pit, About 15 Metres South East Of The Elms

The engine house and associated buildings from the Middle Engine Pit, located about 15 metres southeast of The Elms, date from 1792 to 1837. The engine house, which housed a rotative beam engine, is built of sandstone rubble and features large quoins and a plain tiled roof. It has a rectangular plan and was originally used for pumping, with a drive shaft that emerged through the wall. The engine house also served as a water tower and is taller than it was originally.

Approximately 1.5 metres high and situated about 3 metres north of the engine house are the foundations of a horse whim house, which was used for winding during the sinking of the shaft and later for maintenance. About 30 metres to the north is the weighbridge house, a small rectangular rubble building that was overgrown with ivy at the time of the survey in March 1985.

A map prepared by the Royal Engineers in 1830 referred to the pit as 'Old Nailsea Pit', indicating that the workings reached a depth of 200 feet. The Middle Engine Pit likely worked the Whites and Dungy seams across an area extending from the Trendlewood quarries to the lane down Golden Valley, and from Nailsea Park and Station Road to Trendlewood.