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Trwyn Du Penmon
The Lighthouse is 29m tall and was designed by James Walker and built in 1835-1838. The Lighthouse has a stepped base designed to discourage the huge upsurge of waves. Austere vertical walls, instead of the usual graceful lines of other rock towers, are probably an economy measure. When constructed the lighthouse was manned by two keepers, but these were withdrawn in 1922 when the lighthouse was converted to unwatched acetylene operation. In 1996 it was converted to solar power. Work to modernise the station included the development of a unique operating mechanism to work the 178Kg fog bell.
There is a lot of interesting information here http://www.penmon.org/page6.htm