Just found this blog with some stunning photographs of the quarry/region as well as some interesting hostory.

GeoTopoi

Date 27 November 2011
Location Ogwen Bank, Bethesda SH 62484 65553; 53.16925°N, 4.05868°W

Information

Compressed air to power pneumatic tools at Penrhyn Quarry was formerly supplied from the turbine house close to the banks of the Afon Ogwen.

Kendal-based manufacturers Gilbert Gilkes & Gordon have been supplying small hydropower systems since 1856 and have now delivered over 6500 turbines worldwide. The Gilkes turbine installed here is dated 1929 and was fed via a pipeline taking water from further upstream on the Ogwen. Exhaust water leaving the turbine was channelled below what is now Lon Las Ogwen cycle track before being returned to the river.

The turbine powered a 1918 air compressor manufactured by Fullerton Hodgart & Barclay. This firm was established in 1838 and operated from the Vulcan Foundry in Paisley until the company went into liquidation in 1977.

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