Gelli-groes Mill

Gelli-groes Mill is a T-shaped former corn mill dating back to the 19th century, featuring an overshot waterwheel on the east side, with a mill-race running southeast to the river. The building is constructed of whitened rubble and has a stone tile roof with sprocketed eaves. It stands two storeys tall. On the first floor, the gable end facing the road has a small light with a hood above it, and a Victorian letterbox is inserted into the wall below. There is a blocked wide cambered arched opening with a smaller doorway inserted to the right. The upstream frontage includes a casement window at first floor level, a large splayed central buttress, and an altered opening under a wide lintel low to the right. To the left, the restored millrace is at a higher level with steps leading up to a doorway at first floor level. The gable end facing the river features three small windows with sills, the ends of four tie beams above, and below, an opening for the mill wheel that has a casting date of 1992; this is iron-framed with wooden buckets. The lower attached wing has a steeper pitched roof, a wide buttress beside the doorway, triangular ventilators, and a blocked opening in the gable end, along with an inserted or enlarged window on the river side. Quern stones are displayed at the front.

Inside, the mill retains a complete set of machinery at a stepped first floor level, along with tools and materials related to milling and the history of Gelli-groes Mill and the surrounding area. The ground floor serves as a further display area with machinery in situ, featuring a flag floor and very heavy beams for the ceiling. The roof structure has been renewed. According to the Royal Commission on the Ancient and Historical Monuments of Wales description of the machinery in 1975, the overshot wheel drives a 12-foot diameter pit wheel via a cast-iron shaft, which meshes with an 18-inch cog driving an axial shaft. This carries a pulley with a belt-drive and two 6-foot bevel-wheels, each of which drives a stone-nut. The belt from the lower shaft drives a second axial layshaft, which provided power for flour-dressing machines (only one remains) and the sack-hoist. The sluices to the leat and launder are controlled from this floor.