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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)

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

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