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Latitude: 53.0715 / 53°4'17"N
Longitude: -3.0676 / 3°4'3"W
OS Eastings: 328569
OS Northings: 353225
OS Grid: SJ285532
Mapcode National: GBR 72.BKCQ
Mapcode Global: WH77S.V2F5
Plus Code: 9C5R3WCJ+HX
Entry Name: Pen-Rhos Engine House
Listing Date: 1 December 1995
Last Amended: 1 December 1995
Source ID: 14889
Building Class: Industrial
Location: On the N side of the road running on the W side of the former Steel Works site, W of Pen-Rhos Farm.
Traditional County: Denbighshire
Late C18, almost certainly built for John Wilkinson, one of the leading iron-masters and technological innovators of the industrial revolution. It was probably built to house a Hornblower double cylinder engine, pumping for a coal mine. Jonathon Hornblower was an independent engine designer and builder of the period, who was developing the Newcomen engine into a modern form in competition with Boulton and Watt. The engine house was converted into a dwelling c1820, but later abandoned.
Tall beam engine house. Battered walls of rough rubble with dressed stone quoins and dressings; roofless, but with moulded kneelers to gable copings, and brick stacks on the two gable ends, added when the building was converted into a dwelling. Beam arch high in bob-wall to S gable, partially blocked to convert to domestic window; semi-circular with dressed stone voussoirs. Small doorway to lower right in this gable. Remains of what may have been a square stack to the E.
Listed as an exceptionally rare survival of a C18 beam engine house, dating from a period when the design of the steam engine was rapidly evolving.
Scheduled Ancient Monument De 203.
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