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If he had used ' polyplastic ' it could have sold for heaps of money !. Instead of it,s return to water. spacesailor

The Bell Rock Lighthouse construction story ....   http://www.engineering-timelines.com/who/Stevenson_R/stevensonRobert4.asp

One of the most famous of these isolate lighthouses is Bell Rock Lighthouse, off the coast of Angus, Scotland. It is the world's oldest surviving sea-washed lighthouse. The rock was the scene of many shipwrecks as it lies just below the surface of the sea for all but a few hours at low tide. It was built between 1807 and 1810  by Robert Stevenson on the Bell Rock (also known as Inchcape) in the North Sea, 11 miles (18 km) east of the Firth of Tay. Standing 35 metres (115 ft) tall, its light is v

Hard enough job today but how in blazes did they do it before modern motorboats? And how did they build it?

Lighthouse crew change.