In the 19th century, ships were often recklessly overloaded, resulting in those ships going down and the crews being lost at sea. In 1875, to remedy this negligent practice, British politician Samuel Plimsoll led the charge for legislation to create a line on the side of a ship to show if it was carrying too much cargo. That “load line” became known as the Plimsoll Line, and it continues to mark the hulls of ships today.