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He would have needed to understand the principles of bouyancy as first proposed by Archimedes - you know - Eureka and all that. He devised a system to assess the safe laden weight of a ship at sea by painting a line on the side of the vessel at the level of the sea floating the ship when she could carry no more. Put more on the boat and the line would be below the surface of the sea and that would be an indicator that the boat is overloaded.

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18y ago

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