Cof Cymru: National Historic Assets of Wales · Wales
Transformer House
Llanllyfni, Gwynedd, Wales
A Grade II listed building in Pen-yr-Orsedd, Caernarfon, Llanllyfni, Gwynedd, designated on 21 July 2000.
The record
- Designation
- Listed building, Grade II
- Broad class
- Industrial
- Date of designation
- 21 July 2000
- Locality
- Pen-yr-Orsedd
- Town
- Caernarfon
- Community
- Llanllyfni
- Unitary authority
- Gwynedd
- Country
- Wales
- Coordinates
- 53.06400, -4.22505
- Cadw reference
- 23672
Slide toward Today to fade the historical sheet and see the modern map underneath.
David Rumsey Map Collection, Stanford LibrariesDavid Rumsey Map Collection, Stanford LibrariesDavid Rumsey Map Collection, Stanford LibrariesLlyfrgell Genedlaethol Cymru – The National Library of WalesDavid Rumsey Map Collection, Stanford Libraries
5 historical maps cover this location, the earliest the 1795 map "To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most humbly inscribed by his obedient humble servant" (Llyfrgell Genedlaethol Cymru – The National Library of Wales).
Historical maps covering this location
- 1795 · To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most… (Llyfrgell Genedlaethol Cymru – The National Library of Wales)
- 1883 · Watershed map England, Wales 3. (David Rumsey Map Collection, Stanford Libraries)
- 1896 · Sheet 7. Ordnance Survey of England and Wales. (David Rumsey Map Collection, Stanford Libraries)
- 1899 · 118 Nevin (Hills) (David Rumsey Map Collection, Stanford Libraries)
- 1901 · Sheet 9 and 10. (David Rumsey Map Collection, Stanford Libraries)
Cadw's description
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.
History
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.
Exterior
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.
Interior
Access not available at time of Survey.
Reason for designation
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.
Nearby in the register
- Engine and Compressor HouseIndustrialunder 1 mi
- Locomotive ShedIndustrialunder 1 mi
- Engine HouseIndustrialunder 1 mi
- Drying HouseIndustrialunder 1 mi
Other entries of the same register within about three miles of this one, by straight line.