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mtbdudex

macrumors 68030
Aug 28, 2007
2,900
5,277
SE Michigan
e00536554a4a61cfcb52dcccc8eaa62f.jpg
 

xodh

macrumors demi-god
Apr 14, 2015
338
4,572
Manchester, England.
Where’s that?! Looks awesome.
My photo shows part of the six-sided fresnel lens in South Stack Lighthouse, on Ynys Lawd a small island off Anglesey, Wales.

It was an interesting tour/visit. As I understand it, that lens assembly was constructed in 1873 by Chance Brothers of Birmingham, and is still in use today. What is further fascinating is that the lens assembly 'floats' on a trough of liquid Mercury for an almost frictionless rotation.

https://www.trinityhouse.co.uk/lighthouse-visitor-centres/south-stack-lighthouse-visitor-centre
 
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