Machen Mill is named only as 'Melin' on the 1st edition of the 25-inch O. S. map (Monmouthshire Series), and as Machen Mill on the 2nd and 3rd editions of the Glamorganshire Series. Its function is not recorded on any of these maps, but it is assumed to have been a corn mill. A weir on the Afon Rhymni directed water to the mill via a 170-metre leat, and the water then flowed via a 460-metre tailrace from which water could be directed to the Pandy some 500 metres to the south-east.
W J Crompton, RCAHMW, 5 May 2011.