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Pen-y-Bryn Quarry Engine House

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Figure 78. At Pen y Bryn in Nantlle, water wheels on the hillside powered rod-systems operating the pumps in Twll Balast and Old Pen y Bryn pit. The pumps raised the water to the outflows, which took the water through tunnels to where it emptied into the river on the valley floor to the south

Ffigur 78. Ym Mhen y Bryn yn Nantlle, pwerai olwynion dwr ar y llechwedd systemau rhodenni a weithredai'r pympiau yn Nhwll Balast ('Pen-y-Bryn Slate Quarry') a'r twll yn y gogledd-orllewin. Codai'r pympiau'r dwr i'r all-lifoedd, a ?i ?'r dwr drwy dwneli i'r man lle y c?i ei ollwng i'r afon ar lawr y dyffryn i'r de. (h) a hawl cronfa ddata Hawlfraint y Goron a Landmark Information Group Ltd (Cedwir pob hawl 2014)

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