Samuel Plimsoll (February 10, 1824 - June 3, 1898) was a British politician and social reformer, now best remembered for having devised the Plimsoll line.

He was born at Bristol. Leaving school at an early age, he became a clerk, and rose to be manager of a brewery in Yorkshire. In 1853 he attempted to set up in business in London as a coal merchant. He failed, and was reduced to destitution. He himself told how for a time he lived in a common lodging-house on 7/2d. a week. Through this experience he learnt to sympathize with the struggles of the poor; and when his good fortune returned, he resolved to devote his time to improving their lot. His efforts were directed especially against what were known as "coffin-ships"--unseaworthy and overloaded vessels, often heavily insured, in which unscrupulous owners were allowed by the law to risk the lives of their crews. Plimsoll entered parliament as Liberal member for Derby in 1868, and endeavoured in vain to pass a bill dealing with the subject. In 1872 he published a work entitled Our Seamen, which made a great impression throughout the country. Accordingly, on Plimsoll's motion in 1873, a royal commission was appointed, and in 1875 a government bill was introduced, which Plimsoll, though regarding it as inadequate, resolved to accept.

On July 22, the premier, Benjamin Disraeli, announced that the bill would be dropped. Plimsoll lost his self-control, applied the term "villains" to members of the house, and shook his fist in the Speaker's face. Disraeli moved that he be reprimanded, but on the suggestion of Lord Hartington agreed to adjourn the matter for a week to allow Plimsoll time for reflection. Eventually Plimsoll made an apology. The country, however, shared his view that the bill had been stifled by the pressure of the shipowners, and popular feeling forced the government to pass a bill, which in the following year was amended into the Merchant Shipping Act, This gave stringent powers of inspection to the Board of Trade. The mark that indicates the limit to which a ship may be loaded became generally known as Plimsoll's mark or line. Plimsoll was re-elected for Derby at the general election of 1880 by a great majority, but gave up his seat to William George Harcourt, believing that the latter, as home secretary, could advance the sailors' interests more effectively than any private member. Though offered a seat by thirty constituencies, he did not re-enter the house, and later became estranged from the Liberal leaders by what he regarded as their breach of faith in neglecting the question of shipping reform. He held for some years the presidency of the Sailors' and Firemen's Union, and drew attention to the horrors of the cattle-ships. Later he visited the United States to try to secure the adoption of a less bitter tone towards England in the historical textbooks used in American schools. He died at Folkestone.

This entry was originally from the 1911 Encyclopedia Britannica.