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Latitude: 53.0627 / 53°3'45"N
Longitude: -4.2272 / 4°13'38"W
OS Eastings: 250848
OS Northings: 354034
OS Grid: SH508540
Mapcode National: GBR 5K.C5M2
Mapcode Global: WH54Z.189X
Plus Code: 9C5Q3Q7F+34
Entry Name: Engine House
Listing Date: 21 July 2000
Last Amended: 21 July 2000
Grade: II
Source: Cadw
Source ID: 23721
Building Class: Industrial
ID on this website: 300023721
Location: Located to the north-west of the Eureka slate mill on Level VIII (Bonc Brig) of Pen-yr-Orsedd Slate Quarry.
County: Gwynedd
Town: Caernarfon
Community: Llanllyfni
Community: Llanllyfni
Locality: Pen-yr-Orsedd
Traditional County: Caernarfonshire
Tagged with: House
Engine house built in the early C20 as part of a major phase of investment in the quarry, which saw the introduction of alternating current electricity from Cwm Dyli power station to operate the blondin ropeway system, which was established to take material from the new deep slate pits being formed at this time: the engine house powered this ropeway system. The quarry opened c1816 and in 1863 it was bought by W A Darbishire & Co. During the 1890s about 450 men worked here: it finally closed in 1997.
Regularly coursed slate slabs; slate roof with integral end stack to right. Single rectangular window opening to east (window missing); right gable end has 6-paned sash with projecting slate lintel, above which is a 2-light casement window. West elevation has multi-paned window to left and doorway to right; rooflight to bottom of roof slope to left. Associated with blondin ropeway system.
Retains winding drum operated from a Bruce Peebles 3-phase motor of 1906 through reduction gearing, of which the motor, control mechanism and liquid controller survive.
Included as an early C20 engine house house retaining its original machinery, important for the evidence it provides of the pioneering new technology being introduced to the quarry at this period; group value with other structures on Level VIII.
Scheduled Ancient Monument (208).
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