1802 - Steam Dredger
11th April. The World’s first Steam dredger was launched; designed and built in Portsmouth by Sir Samuel Bentham. (Generally it is thought that Simon Goodrich, the machinist of Bentham’s staff was responsible for much of the machinery design.)
Bentham proposed to the Admiralty the building of a steam dredger on the 18th April 1800. Only the dredging machinery was worked by the 12hp steam engine which was built by John Lloyd of Westminster, London. The vessel was later towed to Woolwich.