Felin Meyllteyrn is shown as a working corn mill on all three editions of the 25-inch O. S. map. An 850 metre long leat brought water from a dam on the Afon Soch along the west side of the valley to a pond above the mill. The waterwheel was on the north side of the L-plan building.
The mill has been converted to a dwelling, retaining part of the wheelpit, above which there is a ceramic pipe leading from the pond,blocked by a wooden bung. A decayed, square wooden axle with a cast iron cross-gudgeon secured by three wrought iron rings lies at the south side of the mill. In the garden to the south of the former mill is a small shed, against which stands a large overshot waterwheel which probably incorporates the cast iron shouds of the mill wheel reassembled on tubular iron spokes; it is much narrower than than would have been accommodated by the original wheelpit and has part-curved iron buckets. Inside the shed the former pitwheel is mounted on the cylindrical steel axle, with extra steel plates and weights added as if to form a flywheel. The installation was built by a former owner of the site, and is supplied with water by an underground pipe and siphon to a launder above the wheel; there is no indication of what it was intended to drive. It is said that at one time a belt or wire drive was taken to a farm on the hillside to drive a gorse mill.
W J Crompton, RCAHMW, 12 August 2010.