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Engine and Compressor House

A Grade II Listed Building in Llanllyfni, Gwynedd

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Coordinates

Latitude: 53.0641 / 53°3'50"N

Longitude: -4.2254 / 4°13'31"W

OS Eastings: 250977

OS Northings: 354185

OS Grid: SH509541

Mapcode National: GBR 5L.BS2H

Mapcode Global: WH54Z.275V

Entry Name: Engine and Compressor House

Listing Date: 21 July 2000

Last Amended: 21 July 2000

Grade: II

Source: Cadw

Source ID: 23673

Building Class: Industrial

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

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History

Engine and compressor 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 and compressor 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.

Exterior

Regularly coursed slate slabs with some roughly coursed rubblestone; slate roof with purple brick stack in roof slope to long wall on front. Engine house of rectangular plan with lean-tos attached to left gable end and to front on right, the latter being the compressor house. Boarded door and 6-paned window to right gable end of engine house. Associated with a collapsed blondin ropeway system.

Interior

The engine house has its winding drums, operated from a Bruce Peebles 3-phase motor of 1906 through reduction gearing, of which the motor, control mechanism and the liquid controller survive. The compressor house contains an electric motor and a horizontal single-cylinder Ingersoll Sargeant air compressor and receiving chamber.

Reasons for Listing

Included as an early C20 engine house and compressor 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).

Other nearby listed buildings

  • II Transformer House
    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.
  • II Engine House
    Located on Level VIII (Bonc Brig) of Pen-yr-Orsedd Slate Quarry at the foot of the modern steep access road from Y Fron.
  • II Locomotive Shed
    Located on Level VIII (Bonc Brig) of the Pen-yr-Orsedd Slate Quarry to the east of the modern steep access road from Y Fron.
  • II Drying House
    Located on Level VIII (Bonc Brig) of the Pen-yr-Orsedd Slate Quarry at the foot of the modern steep access road from Y Fron.
  • II Engine House
    Located on Level VIII (Bonc Brig) of Pen- yr-Orsedd Slate Quarry at the foot of the modern steep access road from Y Fron.
  • II Winding house
    Located on Level VIII (Bonc Brig) of Pen-yr-Orsedd Slate Quarry to the east of the Eureka Slate Mill.
  • II Eureka Slate Mill
    Located on Level VIII (Bonc Brig) of Pen- yr-Orsedd Slate Quarry immediately to the north-east of the slate steps leading down to Level VI (Bonc yr Offis).
  • II Engine House
    Located to the north-west of the Eureka slate mill on Level VIII (Bonc Brig) of Pen-yr-Orsedd Slate Quarry.

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