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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 southDownload and purchase options
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    NPRNTitleType Of SiteArchivesImagesNPRN33674TitlePen-y-Bryn Quarry Engine HouseType Of SiteENGINE HOUSEArchives8Images2