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Samuel Plimsoll. In the Middle Ages, the Venetian Republic, [4] the Republic of Genoa and the Hanseatic League required ships to show a load line. In the case of Venice this was a cross marked on the side of the ship, [5] [6] and of Genoa three horizontal lines.
The load line (also known as Plimsoll line) is the waterline which indicates the legal limit to which a ship may be loaded for specific water types and temperatures in order to safely maintain buoyancy. [2] For vessels with displacement hulls, the hull speed is defined by, among other things, the waterline length.
Samuel Plimsoll (10 February 1824 – 3 June 1898) was a British politician and social reformer, now best remembered for having devised the Plimsoll line (a line on a ship's hull indicating the maximum safe draught, and therefore the minimum freeboard for the vessel in various operating conditions). [1]
Plimsoll may refer to: Plimsoll (surname) The plimsoll symbol (⦵ or o) that is used as a superscript in the notation of thermodynamics to indicate a specific arbitrarily chosen non-zero reference point ("standard state"). Plimsoll line or Plimsoll mark on a ship's hull, named after Samuel Plimsoll
Plimsoll line. Also National Load Line. A special marking, positioned amidships, that indicates the draft of the vessel and the legal limit to which the vessel may be loaded for specific water types and temperatures. plotting room See transmitting station. pocket battleship
Loadline displacement – The weight or mass of the ship loaded to the load line or plimsoll mark. Deadweight tonnage (DWT) is a measure of how much weight a ship can carry. [1] [2] [3] It is the sum of the weights of cargo, fuel, fresh water, ballast water, provisions, passengers, and crew. [1]
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LOA (length overall) & LWL (length at the waterline) Detailed hull dimensions A vessel's length at the waterline (abbreviated to L.W.L) [1] is the length of a ship or boat at the level where it sits in the water (the waterline).