Princess May Water Balance, Penrhyn Quarry
|Date||29 January 2011|
|Location||Penrhyn Quarry, Bethesda||SH 62154 65387; 53.16768°N, 4.06354°W|
Princess May is one of the two surviving water balances at Penrhyn Quarry; the other is called Sebastopol and has been restored. Originally there were eight at the quarry.
The water balance was used to lift quarried slate from a lower level to a higher one and employed water to counteract the weight of the payload. Two wagon platforms with water tanks on top were connected by a cable running over the top of a large wheel. When one platform was ready at the bottom with a full wagon and an empty water tank, the other platform, at the top with an empty wagon, had its tank filled and was allowed to descend under the weight of the water, thereby lifting the other platform to the top.