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How do they build ships on a slope?

shipbuilding.jpgQuestion

When you build a ship on a slope, how do they get everything level and plum?
Tim, London

Answer

** Definitive **
Name: David
Qualification: Ex-shipbuilder (not really, it's just obvious!)
Answer: The keel will be a the ground level, but you'd have more supports at the front to make it level. So it's not actually built on a slope. It's similar to when a ship goes into a dry dock, they block it up in the shape of the hull, so it will be level for working on.