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Latitude: 53.061 / 53°3'39"N
Longitude: -4.2277 / 4°13'39"W
OS Eastings: 250813
OS Northings: 353846
OS Grid: SH508538
Mapcode National: GBR 5K.C5JD
Mapcode Global: WH54Z.1B37
Plus Code: 9C5Q3Q6C+9W
Entry Name: Compressor House
Listing Date: 21 July 2000
Last Amended: 21 July 2000
Grade: II
Source: Cadw
Source ID: 23741
Building Class: Industrial
ID on this website: 300023741
Location: Sited higher up the slope away from the other buildings on Level VI (Bonc yr Offis) of Pen-yr-Orsedd Slate Quarry.
County: Gwynedd
Town: Caernarfon
Community: Llanllyfni
Community: Llanllyfni
Locality: Pen-yr-Orsedd
Traditional County: Caernarfonshire
Tagged with: House
The compressor house dates from the 1920s and was formerly used to supply air to William and Ellen working levels. The quarry opened c1816 when it was worked by William Turner. In 1863 it was bought by W A Darbishire & Co., after which it underwent substantial modernisation, reflected in the use of both water and steam power. During the 1890s about 450 men worked here; it finally closed in 1997.
Long single-storey rectangular structure of coursed slate rubble, aligned roughly east-west; slate roof with end stack. Roughly central doorway flanked by tall window openings, all joinery missing at time of Survey.
Inspection not possible at time of Survey but known to contain the concrete bases for a prime mover and the compressor; the air receiving cylinder also survives.
Listed as part of the remarkably complete complex of buildings at the Pen-yr-Orsedd Slate Quarry, important for the evidence it contributes towards an understanding of the operation of the quarry during the 1920s.
External links are from the relevant listing authority and, where applicable, Wikidata. Wikidata IDs may be related buildings as well as this specific building. If you want to add or update a link, you will need to do so by editing the Wikidata entry.
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