What's A Plimsoll Line?

The plimsoll line is the marking on a ship's hull that shows how low or high the ship is resting in the water. BY examining the plimsoll line it is possible to tell how heavy a load the ship is carrying and it serves as a warning against overloading. A ship riding too low in the water will become dangerously unstable and could capsize. The marking is now mandatory and international. It is also known as a Load Line or the International Load line. The name Plimsoll comes from the british social reformer Samuel Plimsoll who first advocated an international standard to prevent unnecessary loss of life at sea. Until the load line became more widely used ships were often dangerously overloaded causing many tragedies. The level of  a ship in the wate ria affected by temperature and salinity as well as load and so different levels are shown with code letters to indicate the type of water.

The Plimsoll line is named after Samuel Plimsoll, a member of the British Parliament, whose crusade against ship overloading, resulted in Parliament passing the Unseaworthy Ships Bill into law in 1876. The law required that all commercial vessels bear a load line. This load line was soon known as the "Plimsoll Mark" and was eventually adopted by all maritime nations of the world.
The Plimsoll line is a load line on the side of a ship. The purpose of a Plimsoll line is to ensure that a ship has sufficient freeboard and thus sufficient reserve buoyancy. All commercial ships, have a load line symbol permanently marked amidships on each side of the ship. The load line makes it easy for anyone to determine if a ship has been overloaded. This symbol, also called an international load line, indicates the maximum safe draft, and therefore the minimum freeboard for the vessel in various operating conditions.

A Plimsoll line is a line on on the hull of a ship showing the level that the water should reach if the ship is properly loaded(after Samuel Plimsoll, who advocated its adoption.)

A marking on a boat's hull.

A line of which can show how high or low a boat is floating

I thing on a bout that measures the depth of water

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It is officially name the International Dead Line indicates the highest mark to which the water line can reach in difficult types of water when the ship is loaded.