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Latitude: 53.064 / 53°3'50"N
Longitude: -4.225 / 4°13'30"W
OS Eastings: 251000
OS Northings: 354177
OS Grid: SH510541
Mapcode National: GBR 5L.BS6D
Mapcode Global: WH54Z.27BX
Plus Code: 9C5Q3Q7F+JX
Entry Name: Transformer House
Listing Date: 21 July 2000
Last Amended: 21 July 2000
Grade: II
Source: Cadw
Source ID: 23672
Building Class: Industrial
ID on this website: 300023672
Location: Located on Level VIII (Bonc Brig) of the Pen-yr-Orsedd Slate Quarry towards the foot of the modern steep access road from Y Fron.
County: Gwynedd
Town: Caernarfon
Community: Llanllyfni
Community: Llanllyfni
Locality: Pen-yr-Orsedd
Traditional County: Caernarfonshire
Tagged with: House
Built in 1906 for the first supply of electricity to the quarry from Cwm Dyli power station, itself opened that year and pioneering in Britain for the being the first to use alternating current. 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 2 transverse gables to the gable ends, that to the front (north-west) larger. Wall below has 2 rectangular window openings (boarded at time of survey); tall doorway with boarded double doors to side (north-east) wall.
Access not available at time of Survey.
Included as a well-preserved transformer house built to provide the first remote-generated electricity supply to the quarry in 1906, a pioneering development at this time.
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